Almost 4 month old poop

Sh

My LO will be 4 months on the 6th and he poops every 3-4 days and the past few stools have been turd like rather than a full diaper full of thinner/watery poop. Strictly formula fed. Color and smell is normal and no blood. He grunts a bit when he’s going but not crying so I don’t think he’s in pain.

Is this type of thicker consistency normal this early on?

I can’t remember with my first son when the poop changed and he pooped all the time 😂