I'm really hoping someone can help me with this - my 4 month old DS went 16 days without pooing last month until he was finally put on senna by the doc. He came off the senna 7 days ago and hasn't had a poo since. I spoke to the doc this morning and he is putting him back on the senna until 6 weeks after I start weaning him. I'm not sure about this decision - won't it just make him even lazier? The doc says it is more important for him to poo, but I just want to get to the bottom (no pun intended!) of why he isn't pooing in the first place. He is a happy, chilled baby with no soreness or discomfort. Should I just let nature take it's course?