Gerbils & Hamsters/Robo Hamster


Me and my sister have 1 robo hamster. I have a male and she has a female. We both keep them in separate cages and every other day we have a play pen for both of them to play in. Then one day which was June 17, 2014 I seen with my own eyes them two mating in the playpen. So i decided not to disturb them until there finished. Now its been almost two weeks and my sister have noticed that her robo hamster is digging holes in her bend-a-bridge and sitting/sleeping in there. She has not gained that much weight but she gained somewhat a little weight. She had not gathered food and put it in her little hole ,and she has not been drinking a lot but she has been eating quite much. Me and my sister doesn't know what's wrong,so i decided to go online to seek help. So the question is.. Is my sisters robo hamster pregnant?

Hi Roger

Thanks for your question.

It is difficult to know for sure if a hamster is pregnant.  It is advisable, however, to assume that she is if you have mated her, until after the usual gestation period, which for a robo is between 22 - 26 days.

Pregnant hamsters tend to bulge on their hips when pregnant, but this often isn't that obvious until they are just a few days away from giving birth.  Try not to over-feed her right now (just give her usual food allowance) as you don't want any unborn babies from getting too large - if she does produce a litter, then you should increase her food intake, and also supplement it with seeds (sunflower, sesame, pumpkin, linseed) and some baby food to nourish her so that she can feed her young.

I'm assuming that you wanted them to mate????? What are you going to do with any babies?  Remember that they become sexually active at 4 weeks, therefore if there are any boys in the litter they would need to be separated out at that time.  Any girls can stay with mum providing they don't fight.  Do check and double check their sexes as I have known many people to become over-run with robos relatively quickly.

I hope this helps you.


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Sheila Adby


Syrian hamsters are my specialty, however, I have kept Campbells,Winter Whites and gerbils in the past. I can advise on most subjects associated with hamsters, including housing, bedding, feeding, handling, new borns and catching escapees. I have had some experience of various health problems with hamsters and can offer my opinion and advice on basic health issues, however I am not a qualified vet and therefore cannot recommend drugs etc. My website is


I have been keeping hamsters and other small animals for more than 12 years. My favourites are Syrian hamsters and I foster litters and 'difficult' hamsters for a rescue centre. My job is to tame hamsters ready for re-homing, which is extremely rewarding. I also enjoy looking after new litters and raising the pups. I have co-written a book on hamsters with my local vet and have a website:

Hamsters in Sickness and in Health - Sheila Adby and Dan O'Neill ISBN186163218-5 (Capall Bann Publishing)

Educated to A Level standard in the UK.

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