My friend is looking for a newborn female baby mouse that she can hand raise herself and eventually breed with her current mouse when its old enough.
Anyone know if this is actually possible or where would be a good place to look into finding one?

Thanks

New borns are reliant on thier mothers for survival, shed be better just getting a youngster (a few weeks old) from a pet shop. But is question why she want to breed them? Firstly a mouse silent be kept alone so if she has a male alone already she's obviously not aware of thier husbandry needs, secondly mice breed quickly and shed need to separate them pretty damn quick, does she have the facilities to do so? Or does she just want cure little mice?

Mice are notoriously difficult to hand raise, I've only ever heard of one person attempt it and 50% of the litter died

Really isn't a good idea, I'd encourage your friend to find her local fancy mouse club and a breeder to chat to if she's serious about breeding.
It can get out of control remarkably quickly.

Four of mine in the past came from someone who thought they had two females, the one litter turned into over 100 inbred mice in just a few months

as above, i used to breed mine (i have 12 females left at the moment)

i had this many females fall pregnant at once just last year.
a few of them took to infanticide, which, though horrible, was a blessing. but there were still over 40 babies left.
i had to buy a large under-bed storage container and drill air holes in the lid so that they had enough floor space.
i think about 28-30 actually survived, that was to be the end of my mouse breeding, but i accidentally mixed them AGAIN and ended up with another three litters.

nightmare.

hand rearing mice is also very time consuming and has a high mortality rate as has been mentioned.
i had a litter whose mother died and i tried hand rearing them due to having no other lactating females at the time, unfortunately none of them made it.

OMG this thread is not for real. Why should anyone want to breed mice?

Although for ethical reasons, I don't agree with the breeding of any animals, mice make amazing pets.

well i had a good reason for breeding them, which i've covered in numerous other threads and had to defend myself over before, and that was to produce quality, high welfare, humanely despatched feeder mice for my snake.
i also produced them to feed my boyfriends and my friends snakes as well.
the boyfriend is now an ex and my friends snake is on rats (which we can buy frozen, sourced from a high welfare breeding facility in the UK)

i wasn't happy with the state of frozen food i was buying from the local stores, the mice were often injured, leathery/tough feeling and had vastly over grown teeth and a few even had tumours.
my snake would refuse to eat a lot of these (she's a kingsnake, which as a species, have a reputation for being greedy guts')
they were bred overseas (apparently in holland) and shipped to the UK with no indication of when the mice were despatched and packaged. and no telling of how they were kept, though it just seemed obvious from the state of some of the mice that welfare wasn't a top priority for the producers.

since starting to breed my own mice about 3 years ago, only once has my snake refused to eat one. (and this was due to her having just gone into shed, i defrosted the prey item before checking on her first)

my snake will also be moving onto the rats mentioned above shortly so i've ceased breeding the mice and am now just raising the 12 females i have left until they are to size.
It costs more and there's a lot more work involved than just going to the shop and buying the mice already frozen, but i much prefer to spend that bit extra on raising my own, knowing that though admittedly, their life is short, i can guarantee that that short time they have has been a good life. they've been well cared for & well fed, all in clean cages with plenty of enrichment and tasty treats.
(as i type they're in their freshly cleaned cage, tucking in to a bowl of banana porridge )

they're wonderful little animals and i have enjoyed keeping them, they make wonderful pets, but as for the average pet-owner breeding them, i don't believe it's a good idea as it's so easy for the population to grow out of control - even when trying to be careful.

i know i didn't have the worry of having to find homes for the 30-40 mice i ended up with, just an issue of finding space to rear them.
but it can happen so quickly, it's difficult to catch.

a mouse is fertile at 10 weeks old.
2-3 weeks after mating they will produce a litter of anything between 1 and 10 pinkies.
at 4 weeks these are old enough to leave and the mother could well get pregnant again straight away if a male is present.
her next litter could have anything up to about 18 pinkies in it (the largest litter i ever got form one doe)

around the time this litter is ready to leave, the first litter will all be sexually active, if still mixed, where in this cycle will repeat for every doe in the first litter.

however by this time as well the mice will be very over crowded and prone to fighting. the lack of space will lead to stress, stress can lead to illness, or louse/mite infestation and you may well have mice dying in the cage.
the remaining mice may well then begin to consume the expired mice.
and well. it doesn't paint a pretty picture really.