Sick and poo

Loads of real people have experienced this because it is normal - in a baby who is thriving and healthy, a slow down of pooing after the newborn stage is well within normal, and because their digestive systems are still maturing, possetting (I'm assuming it's not actual vomit) is very very common.

The poo slow-down happens because the gastric-colic reflexes that produce poo very readily have stopped being 'hair trigger' (it is not because 'breastmilk is totally digestible and there is none left over' - which is a reason that makes no sense as the baby produces loads of poo when he does finally go ).

Sounds like you are a wee bit under confident in the whole process which is really common when you're new to it.....but nothing in your post suggests anything but the fact you are doing just fine