Formula Milk - Mucousy Spit up (Help!)

My baby (7 weeks old) has been drinking Enfamil Gentlease & we noticed that he tends to have quite a bit of spit up/reflux and it’s always mucousy in texture. He also sounds quite congested & sometimes coughs after spit up. We want to try a different formula - anyone who has had such experiences please suggest some brands that would help with this issue! Otherwise, please recommend good & reliable PDs in sg (preferably in North). Thank you in advance!!