There are no rules... Maybe a suggestion for older babies with a longer A time.
At 6 weeks it's very normal to have witching hours, mostly in the evening or for some unlucky people like me with my second from 3-5am.
Generally speaking it's down to a mix of what your baby will do and what youd like for a routine and how they do or don't end up working. At 6wo, I'd let your baby sleep and if you are bf, offer comfortfeeds if he is insettled as it could be a supply issue with feeding as it's common to have low supply late in the day. Also babies do have emotional needs and in a busy day sometimes they just need that skin to skin human contact. It's important to remember that sometimes crying is not always about food or sleep but about emotional connection.
