Feeding and weight gain ! Need help

snh

Hi strong moms , my son is 10 month old and his weight is at 15 percentile and height at 85 percentile . He takes around 33oz of formula and two solids (1-2 oz ) per day . I am wondering what is causing him to not gain weight much . Also would like to know how much your baby takes and how much they weight ? It will be very helpful for me . Thanks