For small children nothing parallels like Ayurvedic appetizers which are safe, harmless and natural.
Neo peptine is good but its a synthetic preparation. May be it shows burst of effect but would it sustain. On the other hand slow acting Ayurveda has sustained effect.
For such babies ARVINDASAV is the best remedy. 5 ml of this liquid and 5 ml of water mixed may be given twice a day.
Additionally, if you can get chebulic myrobalan (
Haritaki - better if you get big one), grind/ rub it against some clean, hard, rough surface like stone etc by adding little water drops. The paste should be given to baby to lick once or twice a day. This may be continued for two weeks or so. Little lose motions initially should not be worried about.
So liquid ARVINDASAV and chebulic myrobalan will not only increase appetite, it will detoxify naturally, give strength and optimum weight gain in babies.
For any further information, pl consult through direct question.
Hope it helps.