Small babies...does anyone have a small baby?

Asking for a family member.. Weighed 6 1/2 lbs at birth and was measuring small throughout the whole pregnancy. breastfeeding. And at last doctors appt (4 months old) weighed 11 lbs 7.5 oz , they’re now saying to supplement with formula cuz he’s too small????? Under 1% percentile for his age. Momma pumps 9 oz in a day when she works 9 hour shift and he usually eats 3-5 oz a feeding in a bottle every 3-4 hours when using one but if mom is home nurses a lot and has a lot wet and poopy diapers

He’s always been a small baby so not sure why doctor is saying to supplement. He’s still gaining weight and gained over 3 lbs since last appt which was at 2 months.

Should look for a new doctor? This doctor isn’t even a baby doctor (regular family doctor that is old) and last appt he acted like everything was fine.

Looking for opinions

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