Nasal congestion in newborn

Hello everyone!! Just wanna have a quick check if any mommies here have tried giving their little one Lactogen 1 formula milk. Any feedbacks on the milk? Bcoz my little bubs seems to have phlegm after having this formula for a couple of days and now she is 20 days old. Still having noisy phlegm. Thought of changing to another formula slowly (any recommendation) bcoz I dont wish her to constipate too if we sudden switch to new formula. Pls help this 1st time mama!! #firsttimemom #advicepls #pleasehelp #firstbaby