Try wati spoon feeding.

Try with spoon

A baby refusing feeds for more than a week is not considered normal and should be examined by a pediatrician. The common causes include painful reflux, oral ulcers/thrush, bottle-feeding issues, or less commonly an underlying illness. Since your baby’s weight gain has been satisfactory so far, this appears to be a recent problem. Please avoid force-feeding, offer smaller frequent feeds, and have your baby evaluated so the mouth, ears, hydration, and feeding technique can be assessed. If the baby is taking much less than usual, has reduced urine output, becomes sleepy, or develops fever or vomiting, seek medical attention urgently.

Try feeding with Paladai or spoon

Keep one feeding diary How many times he passed urine in last 24hrs How many stools he passed

I would suggest to keep trying feeding either by breastfeeding or by katori spoon