I haven't been on here in a while, but my son is 6 months old and ;for the past few days he's been spitting up a lot and can't seem to keep anything down. He hasn't pooped in a while so I was thinking it could be constipation. I only breastfeed him and he just spits that up too and it seems like all of it comes back up, is that normal? I have a doctor visit on Monday.