Baby's poop normal?

Madison

Lately my daughters poop has been a really light yellow. Like pale yellow? Normally it's green and normal looking. Picture include so be careful!! Is it normal? Should I take her to the ER? She's 4 months tomorrow.

EDIT: also she is formula feed, and we have to use up her target brand formula, she normal takes Similac advance. Could it be from the switch or is she teething? Or the start of teething!