As long as they are the full 21 days, they should be just fine. The only issue would be if your water bottle and/or food hopper are placed such that they can't reach it.
Even if they are slightly younger than that, they might be ok. One time I was given some bonus freebie hoppers when I was buying mice. I was afraid they wouldn't make it, because they were on the smaller end of hoppers, and I didn't have any extra snakes that needed that size of a meal. I decided to play it day by day and see how the little hoppers did, and they did just fine. I even decided to keep one that was a female and she is part of my breeding colony now.
I'd be more concerned about finding out how the mother escaped to prevent additional losses.
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