My 4 week baby breath so hard when she drinks milk , it all happens while she is drinking during sleep?

Confusing question: Babies depend on their open nasal passages to breathe normally. If baby must stop feeding to do some breathing or seems to work harder to breathe during feedings, she needs her nose cleaned of any mucous or irritant debris. Dust, smoke & fragrances, make it hard for babies & saline nose rinse is your best rx. I don't know of any babies that drink during sleep, but many sound bad if congested.