Re: 4 week old eastern grey
Eyes open normally at 5 weeks...
Are you sure that's a grey? Could be the lighting but he looks to have a lot
of red coloring especially on legs. Possibly a fox squirrel?
Definitely start transitioning over to the FV 20/50 as soon as possible,
Esbilac formula(s) are unstable and no longer recommended.
Do you have a weight on him?
Attaching a link on baby squirrel care, click on this link it can be a HUGE help.
It's 6 pages long with the next button on the top right corner.
https://www.henryspets.com/1-basic-setup/
Step-N-Stone
State Licensed
Wildlife Master Rehabilitator