Its a little young, but not too young... If they were orphans and you hadnt no proper kmr, you wouldnt hesitate twice.I’ve used goat milk before with one of my cat we found him literally in the road he was young and took goat milk. These kittens however showed no interest and mom ended up drinking their milk are they not to young to be weaned? They are 4 weeks
Here momma is in difficulties, so all are probably grateful for lessening off her burden.