Ah, that's pretty normal for exclusively breastfed babies, lalo na at 5 weeks pa lang! Ang green, watery poop is usually just part ng breastfed baby phase, a few of us mums had the same worry, tapos realized it's totally okay. Pero if the poop becomes super frequent (like more than 10 times a day), smells really foul, or may blood, or if baby seems uncomfortable or lethargic, I'd check with your doctor just to be safe, better peace of mind, di ba?