Blowouts! EVERY SINGLE TIME! TMI

Okay so this might be a little TMI... but i need HELP!

My son who’s almost 7 months is most likely teething. He has been very cranky lately, drooling like no other, and pooping like 3 times a day, most of the time its diarrhea.

I never thought I would say that in my life but I don’t mind the diarrhea. However what I mind is the blowouts, I’m talking about explosions every single time!!

I changed his diapers to a size up and I’m still having the same issue.

What do i doooooo??! I’m traveling with him super soon on a LONG flight and I just can’t stop thinking about his diapers explosions and how I’ll manage.

Am I doing something wrong? Putting the diaper wrong?