My baby was 11 days old, from the last 15 hrs she took only 3 feeds(breast feed) that was too small a quantity. but she was actively moving her legs and hands

A. dear Mum until the baby regains the birth weight you should feed every 2 hours even if you have to awaken baby from sleep after that you can feed on demand if baby is passing urine 6 - 8 times in 24 hours is active alert and gaining adequate weight then feeding is sufficient