Found a Baby Opossum in Your Yard? Here is What to Do

Tuesday morning. 7:14 AM. I'm standing in the damp grass wearing my husband's oversized flannel bathrobe, one fuzzy sock because the dog stole the other one, and holding a mug of coffee that has already been microwaved three separate times. Maya, who's seven and entirely too awake for this hour, is shrieking at a pitch that I'm fairly certain just shattered my neighbor's sunroom window. Leo, my four-year-old, is completely naked from the waist down and wielding a plastic Tyrannosaurus Rex like a primitive club.

And there, trembling next to our sad, rotting compost bin and a half-eaten zucchini, is what I initially assumed was a mutant, rabies-infested monster rat.

It was hissing. Maya was crying. Leo was trying to feed it a Cheerio. I was just blinking into the void, wondering why I couldn't just have a normal morning where we eat frozen waffles and yell about misplaced shoes like every other family in the tri-state area.

The great backyard rat panic of a Tuesday morning

I'm going to be entirely honest with you because we're friends here. I used to absolutely despise opossums. I honestly thought they were just giant, aggressive trash-goblins waiting to ruin my life and infect my entire family with medieval plagues, which I know is completely unfair but that's basically what ninety-something years of animated movies and cartoon villains taught me. Squirrels, on the other hand, get a complete free pass to tear up my garden just because they've fluffy tails and look cute when they hold acorns. Anyway, the point is, I was terrified of this tiny, shaking gray blob in my yard.

My husband Dave finally ambles outside, sipping his perfectly hot espresso, takes one look at the situation, and announces that he's going to "wrangle it." Dave is an accountant. The most dangerous thing he wrangles on a daily basis is a pivot table in Excel. I immediately panic because I'm useless in a crisis and I yell at him not to touch it because it's probably going to bite his face off.

So I did what any rational, deeply anxious millennial mother does in an emergency. I grabbed my phone, locked my kids in the house so they couldn't get bitten, and frantically called my sister-in-law who volunteers at a wildlife rehabilitation center on weekends.

She answered on the fourth ring and immediately told me to calm down, take a breath, and stop acting like an idiot.

Everything I got completely wrong about the opossum

According to my very patient sister-in-law, almost everything I believed about these weird little yard creatures was totally wrong. They aren't rodents at all. Apparently, they're North America's only marsupial. Which means they've a pouch. Like a kangaroo. I've literally lived in the suburbs my entire adult life and I had zero idea that we had actual pouch-bearing mammals just wandering around eating ticks in our bushes.

My understanding of biology is heavily influenced by whatever I half-remember from tenth grade, but I guess female opossums give birth after an insanely short gestation period. Like, 13 days. And when the babies are born, they're the size of a bumblebee. A literal bumblebee! They crawl into the mother's pouch and stay in there growing for like two or three months. I complained bitterly about being pregnant with Leo for forty agonizing weeks, and this creature is out here giving birth to insects in under two weeks. I suddenly felt a weird wave of maternal solidarity with the hissing creature by my compost bin.

Here are some other mildly terrifying but fascinating things I learned while standing in my yard in my bathrobe:

They have an absurd amount of teeth. Like 50 teeth, which is apparently more than any other North American mammal. That's so many teeth for such a small face.
They're basically built like tiny monkeys. They have a prehensile tail for balancing on tree branches and opposable thumbs on their hind feet. Honestly, if they had better PR, people would love them.
Playing dead isn't a parlor trick. I thought they just decided to flop over and play dead when they got scared. Which, no. It's actually an involuntary comatose-like state that their bodies enter when they're threatened, and it can last anywhere from 40 minutes to 4 hours. So if you see one "dead" in your yard, it might just be having a panic attack. Relatable.

Speaking of tiny, vulnerable things playing in the yard, getting my kids to actually respect nature instead of trying to squish it has been a steep learning curve. When Leo was a baby, he practically lived outside in the dirt. We went through so many cheap outfits that just fell apart at the seams the second he crawled over a stray twig. I eventually got smart and bought the Sleeveless Organic Cotton Baby Bodysuit from Kianao. I loved that specific bodysuit so much because it was incredibly soft on his sensitive skin but miraculously tough enough to survive the grass stains, the mud puddles, and whatever weird abrasive textures he decided to rub himself against. Plus, organic cotton is grown without the harsh pesticides, which felt like a tiny victory for our local ecosystem. If you're trying to create a yard that's safe for both your children and the wildlife passing through, browsing some sustainable organic baby clothes is actually a pretty solid place to start.

The 8-Inch Rule (Or: How to know if it's seriously an orphan)

Back to my backyard crisis. I was convinced this tiny animal was a helpless baby opossum that had been tragically separated from its mother and was going to die of exposure next to my zucchini. I was already mentally preparing to adopt it and name it Barnaby.

My sister-in-law stopped my spiral and asked me a very specific question: "How big is it?"

Wildlife experts use a very strict measurement to figure out if human intervention is really needed, because apparently, well-meaning idiots like me kidnap perfectly fine juvenile animals all the time. It's called the 8-Inch Rule.

If the animal is at least 8 inches long from the tip of its nose to the base of its tail—and you absolutely don't include the naked tail in that measurement—and it weighs more than 7.25 ounces (which is roughly 200 grams, though I don't know who's casually bringing a food scale into their yard), it's old enough to survive on its own. It's basically a teenager. You leave it alone. Let it eat your ticks in peace.

However, you definitely need to intervene and call a professional if the little guy meets any of these criteria:

It's smaller than 8 inches long.
It's bleeding or visibly injured.
Your dog or cat had it in their mouth (because pet saliva is apparently highly toxic to them).
It's covered in fly eggs (oh god, my skin is crawling just typing that).
It's cold, wandering aimlessly, and making a weird crying sound.

That crying sound, by the way? It sounds exactly like a tiny sneeze. If you hear a small gray fluff-ball repeatedly sneezing in your bushes, it's calling for its mother and it needs help.

What to seriously do if it needs a rescue

Let's say you measure the thing (visually, from a distance, please don't break out the measuring tape) and you realize it's, in fact, an orphaned infant that needs human help. Don't just scoop it up and bring it into your kitchen.

There are very strict steps you've to follow so you don't accidentally kill the poor thing while trying to be a hero.

Protect your own hands first. Always wear gloves. If it's an older joey, use heavy leather gardening gloves. If it's a tiny infant, latex gloves are fine. You really want to prevent disease transmission and avoid getting its saliva on you.
Provide warmth immediately. You need to get a secure, dark cardboard box and line it with soft, ravel-free towels (no terry cloth loops that their little toes can get stuck in). Place half of the box on a heating pad set to the lowest setting.
Do NOT give it a bath. I don't care if it's covered in fleas. If you submerge a baby opossum in water or try to give it a 'flea bath,' the shock will literally be fatal. Instead, you just wrap them in a warm towel, which apparently makes the fleas jump off safely. Let the rehab center deal with the bugs.
Never, ever feed it cow's milk. I thought you were supposed to give abandoned baby animals a little saucer of milk like in the movies. Absolutely not. Improper feeding causes something called Metabolic Bone Disease, or they just inhale it and die of fatal aspiration.

If the baby's eyes are still closed, you absolutely can't give it food or water under any circumstances. If its eyes are open, my sister-in-law said you can use a specialized puppy formula called Esbilac or a tiny amount of applesauce, but ONLY as a 24-hour emergency measure while you wait for the wildlife rescue to call you back.

Also, don't try to keep it. In most states, it's highly illegal to keep an opossum as a pet without a specialized wildlife rehabilitation permit. Dave was very disappointed by this fact, but I was thrilled because I already have two human children destroying my house and I don't need a marsupial adding to the laundry pile.

Keeping the chaos contained

Speaking of teeth and chewing and small creatures making messes, learning that baby opossums have 50 teeth immediately gave me horrible flashbacks to Leo's teething phase. When he was cutting his first molars, he was gnawing on the coffee table, the dog's toys, my shoulder, literally anything he could get his mouth around. We survived entirely because of the Panda Teether Silicone Baby Chew Toy. It was an absolute lifesaver. He would furiously chomp on the little bamboo textured part for hours while I stared blankly at the wall. We used to throw it in the refrigerator so it was icy cold, which seemed to numb his swollen gums. Plus, it's made of food-grade silicone and is totally BPA-free, which gave me immense peace of mind when he was acting like a rabid animal.

While Dave and I were dealing with the backyard wildlife situation, the kids were still locked safely inside the house pressed against the glass sliding door. When Maya was a newborn and we needed a safe place to put her down so we could, you know, eat or deal with a household emergency, we had the Wooden Baby Rainbow Play Gym set up in the corner of the living room. It's totally fine, it looks very aesthetic and minimalist, and the little hanging wooden elephant was cute. Maya would bat at it for maybe ten or twelve minutes before demanding to be held again, but in newborn time, twelve uninterrupted minutes is basically a luxury vacation.

Eventually, the tiny opossum by our compost bin stood up, shook itself off, and waddled into the neighbor's yard under the fence. It was definitely bigger than 8 inches. It didn't need rescuing at all. It was probably just having a morning nap and we entirely ruined its vibe with our screaming.

I drank the rest of my cold coffee, corralled my half-naked child back inside, and locked the door. Just another quiet, peaceful morning in motherhood. Make sure you're ready for your own unpredictable days and check out the full collection of sustainable wooden play gyms to keep the actual human babies entertained safely indoors while you deal with the yard.

Frequently Asked Questions About Backyard Opossums

What does it mean when a baby opossum is making a sneezing sound?

Honestly, I thought it just had a cold, but apparently, that distinct 'sneezing' noise is really how an infant cries for its mother. If you hear a tiny gray animal aggressively sneezing alone in your bushes and it's super small, it's probably orphaned and needs help from a wildlife rehabber.

Can I give a baby opossum a bath if it's covered in fleas?

Absolutely not. I know the urge to clean them is strong, but don't submerge them in water or give them a flea bath. The sudden temperature change and stress cause a shock response that can literally be fatal. Just wrap the poor thing gently in a warm towel, and the fleas will naturally jump off on their own to seek a better host.

Should I feed an abandoned baby opossum cow's milk from my fridge?

No! Never give them cow's milk. My sister-in-law drilled this into my head. Cow's milk causes severe Metabolic Bone Disease in opossums or fatal aspiration. If their eyes are closed, give them nothing. If their eyes are open, you can use specialized Esbilac puppy formula or a little applesauce, but only for a maximum of 24 hours while you wait for a professional.

How do I know if an opossum is playing dead or genuinely dead?

It's super hard to tell because playing dead isn't a conscious choice they make—it's an involuntary comatose state their bodies force them into when they're terrified. This coma can last anywhere from 40 minutes to 4 solid hours. Your best bet is to just walk away, keep your dogs inside, and check back in a few hours. Usually, they wake up and waddle off.

What size opossum can survive on its own?

You have to use the 8-Inch Rule. Measure them visually from the tip of their pink nose to the base of their tail (do NOT count the naked tail itself). If they're at least 8 inches long and look a little chunky (around 7.25 ounces), they're independent teenagers capable of surviving without their mom. Leave them be!