Milk and Poo

Hello po. 1st time mom here. Ask ko lang po if okay lang ba na yung poopoo ni baby is hindi siya formed? Like never pa na formed.. always basa.. yellow or green yung color po. Pero once lang siya mag poop in a day, minsan di mag poop sa isang araw. Should i change the milk ni baby? She's 5months old na and bottle fed na since day 1 kasi super hina milk supply ko. Thank you for taking time to read this and sa pag answer po.