We have not had a blowout for a while now. I think because his poop is more solid now and less prone to leak out of the sides. In fact we have to be careful with banana because it's constipated him before.
Maybe your little dude could use more banana? Or more fiber?
We haven't had any blowouts here either. Lol in fact his poop looks about like the consistency of his pureed baby foods that I make. I agree with op, maybe tummy sensitivity.
What color are the poops? I would agree that maybe it's a little bit of a GI issue. We have the opposite problem. DD only poops every 2-3 days and we battle constipation issues off and on.
When he eats the orange Gerber purées, the next day his poop usually smells and is the color of what he ate the night prior. I held off on the "meat" purées and have stated giving him bananas and cereal to see if that helps bind him up a little bit.
Re: Baby Blowouts!
Maybe your little dude could use more banana? Or more fiber?