I'm gonna agree with above, snakes can handle a bit of roughage from time to time!
However... If this seems to become a more common occurrence, you may want to consider doing a mix of coconut fiber/cypress mulch or just the coconut fiber. That way you can still keep some good humidity, but possibly reduce some of the larger chunks that they may eat. Or just try to go for a finer grade mulch so that the smaller pieces pass easily.
Sure, like we said, time to time is fine and should pass fairly easily, but I also wouldn't want to risk an impaction because of messy eating habits.
Good news on the baby eating for you tho! Settling in is always the hardest part.