My doctor told me , it is ok for a baby no poo poo for a week. So, you don't worry , your bb just one day no poo poo. If you worry, you can give little water after he drink milk. (But no more 2 oz water per day. My doctor told me that. For NB no need to drink water, The doctor did not recommed to feed NB BB to drink water. But if I really want to , No MORE 2 oz water per day. Otherwise, it may casuse your BB stomach pain).
I still give my BB little water after milk. Because I feel help him to poo. So, you may try try..