baby's weight

Completely fine. Keep eating healthy protein and calcium filled diet.... Like boiled eggs, milk, protein powder with milk, chicken, dal pulses sprouts etc......

Yes but baby should be healthy nothing to worry, may be because of AFI is less . Have more liquid and protein rich food. Nothing to worry.

8 months and 2 kg is helathy. By delivery your baby will weigh from 2.750 kg to 3.500 kg

Yes but try to take healthy diet like eggs chicken.