yes, if you're on BM it's normal not to poop everyday as BM is easily digestible.
you can feed baby probiotics with vit D and I highly recommend Vivomixx, which is what my PD prescribed but buy from Shopee cheaper as now can stack with vouchers.
https://s.shopee.sg/20eBPODnpy
don't buy Biogaia despite what other mummies recommend because it only contains one strain of bacteria, which is as good as doing nothing??