Pickles and Ice Cream or She's Having My Baby, er, Babies

Q: How long is a rat’s gestation?
A: Rats typically deliver 21 – 23 days after mating. Most of my girls favor day 22 or 23, but be prepared for your rat to deliver by day 20 just to be safe.


Q: I bought a rat from a pet store and she seems to be getting a big round belly on her – should I panic?
A: No, but you should start knitting tiny baby booties. A LOT of them.


Q: No, seriously, how do I tell if my rat is pregnant?
A: Alas, there are no home pregnancy test kits for rats, but, boy, it’d be nice if there were! If you did not actually see the rats mating, predicting delivery dates can be a bit tricky. Most females start to show a growing belly by the third week of pregnancy. Some are quite sneaky, especially if they have rather rounded figures to begin with, and don’t show until a few days before delivery. Also many pregnant does begin to show obvious nipples by the third week, so that's another sign of probable pregnancy. If you do suspect your girl is pregnant, you may want to separate her from her cagemates and get her into a safe nursery cage just to be on the safe side. If your rat has not delivered babies within 3.5 to 4 weeks of suspected mating, you’re in the clear and can stand down from red baby alert.


Q: Should I supplement my pregnant rat’s diet?
A: Pregnant and lactating females need extra protein in their diets, so it’s a good idea to provide that. Some breeders like to add in a low-fat cat food to their pregnant does’ mix and some supplement with soy baby formula or kitten weaning formula like KMR. My ladies LOVE the Iams low-fat cat food in dry format though your does may have their own preferences.


Q: What kind of cage makes a good nursery?
A: I prefer a small cage with small wire spacing and at least a 3 inch pan to set the cage inside. I also like to take out the hammock before delivery as I had one doe choose to deliver inside the hammock and that worried me greatly that the babies could fall out and be injured. Some breeders use glass or plexiglass aquariums but I prefer wire cages for better ventilation personally.

Q: Should I separate my pregnant girl from her cagemates for delivery?
A: Personally, I would say yes. I like to reduce as much as possible the odds of anything going wrong. The "nanny" doe might decide to steal the babies from the nursing mother and they could be harmed or go hungry in the process. The girls might tussle, even playfully, and squash a baby accidentally. Having a second doe in the mix just adds one more variable to the equation and that is not something I'm personally comfortable with. If you are concerned about reintroducing your girl back into her regular cage after the babies are weaned, you might schedule a daily playtime for mum to frolic with her cagemates for 15 - 30 minutes (or more as the babies get older and need mum less) every day so that familiarity is maintained.


Q: What kind of bedding should I use for delivery day?
A: I prefer NOT to use Carefresh or any recycled paper pellet litter as it tends to stick to the babies when they are born. Plus it can be quite dusty and clog up tiny noses and mouths. It’s fine once the babies are a bit older, say a week or so, but I don’t like it for delivery. I line the cage with newsprint and provide mum a lot of nice paper towels for shredding and nest making. Cloth can also be fine for nest making but do NOT use anything like t-shirt material or other easily frayed cloth as the tiny strands of thread can come unraveled and wrap around tiny baby legs, cutting off circulation. I know this from experience. It turned out fine for the poor baby in the end, with no permanent damage, but it was scary and painful for the dear little guy and I still have rat guilt to this day about it even though Siggi insists he forgives me.

Rat Breeding FAQ Index