Adorable babies
I hope you have a good rat vet and are planning on getting them spayed and/or neutered when they are a bit older.
Spaying has many health benefits for girls - one of which is reducing the risk of mammary tumour from over 85% down to 3%-4% if spayed by 4 months old
Neutering also has health benefits but not as many as spaying
and once fixed, they will be able to live together as one happy group
(although you have to wait a few weeks after neuters to make sure all the sperm are dead if the girls are not spayed)
Having two intact sexes in the same home is an accident waiting to happen
because rats are very smart and very motivated when girls are in heat (every 3 to 4 days)
and people are not perfect 100% of the time
I have heard of boys in cages in the basement getting to girls in heat in cages in a 3rd storey bedroom
Average litter size is 12 to 14 babies and rats can have as many as 25 or 26 babies in a litter
and that would be a lot to deal with
all the best with your sweet ratties