My 3 month old only nurses for 5 minutes most times per session. Some days she’ll nurse longer but it’s mostly 5 minutes. Gastroenterologist says that she is still really low on the percentile scale weighing at 10 pounds at her 3 month follow up. She was born on the 28th. Anyone else experiencing this?

Ps. The Gastroenterologist wants me to supplement with formula but she seems happy and gets full after each feed. She was also born at 5 lbs 7 oz