My son has started talking recently (baby talk). He’s almost 5 months old and has been saying more and more things. He has also started this thing when he is on his back where as he is making noises he burrows down as if you are struggling to get a poop out, to the point his face goes red like he runs out of breath and is still trying to push out. Thought constipation but he has vowel movements. Also though maybe trying to say something new and struggling to get it out or getting frustrated? Then though maybe a small seizure? Dr saw a video and said maybe acid reflux or gas..but not sold on that. Wanted to get some opinions. Has anybody ever seen something like this with other babies? Any dr’s have an opinion?