16 week old & diarrhea

Hi Mommas,

I'm a FTM and my son (since he had hes last vaccination) in friday has diarrhea (watery, yellow and seedy)

I'm wondering if this is from the vaccine?

What can I do to help him?

Hes only had 4 of these poopy diapers since Saturday afternoon (it's now Sunday afternoon)

I'm making him drink little every hour or so as hes not taking hes normal full bottles, doing this to keep him hydrated.

Hes still acting himself and I'm still getting wet diapers.

Any advice is welcome 🙏

Also hes been formula feed since 2.5 months & is on similac total comfort