my 4 week old Hasnt really pooped in the last 2 days and he's breastfed. He just keeps passing gas. He pooped once…

my 4 week old

Hasnt really pooped in the last 2 days and he's breastfed. He just keeps passing gas. He pooped once yesterday and once today. Also, since 2 nights ago he has a stuffy nose. I can literally suction snot out. At night I can't sleep because he sounds twrrible lile he cant breathe. Any suggestions?