At 18 days they should be starting to eat lab block and drink water....but still need moms milk some.

I wean completely at 21-24 days.

Do you have any other breeder females aside from the one with the 2 day old litter?

The problem with placing them with her is ...that is alot of work for one female to care for 2 litters with that many pups. The other problem is that the older ones may push the lil ones aside for milk and leave them to starve. or...the big ones can pile on top of the babies and suffocate them.