omg my baby was like this too when he turned 4 months... same!!! I fully Bf him tho... so I was worried and I asked doctor during his 4 months checkup but she said it's okay not to poop everyday as long as there's no sign of constipation or straining... nothing to worry if U bf Ur baby... my baby poop every 2-3 days once 🤣 sometimes so brown.. sometimes ABIT greenish but that's fine... now he's going to 5 months... I massage his belly and back with yu yee oil every night before sleep.. and do bicycle kicks with his legs... Ur baby will be fine...