What lotion should I use? Help please

Honestly, a few of us moms tried switching from Mustela too and Aveeno Dermexa was the game-changer for our sensitive babies, super gentle and it actually helped with the itching from bites, which is what you need. Since your derma recommended a switch, I'd go with whichever one they specifically suggested kasi alam nila ang skin type ng baby mo, pero if it's open, Aveeno is a safe bet and maraming moms here swear by it for sensitive skin na prone sa mosquito reactions.