He's five months now and seems to enjoy when we visit grandma and grandpa. This being his third visit. We usually go there on Friday and go home sun or mon. Every time we go he starts spitting up a lot after 1-2 days. He's exclusively breasted so it's nothing he eats. Can it be stress? Over stimulation? Any suggestions on what it could be or what to do about it? I feel so bad for him and u gotta figure out the cause as we might be looking at spending like a month at their place this summer. I cannot have him get sick or stressed out. I really just need it advice ladies.