Breastfeeding is always the best. But if you're looking for an alternative, you can try Aptamil formula. It's closest to breastmilk and has prebiotics. We used it as per our paediatrician suggested.

Hi Madhu this partial breastfeeding does not work out. Because the more formula milk the less sucking your breast, less sucking body will produce less milk and one day it will stop producing. So combination feeding doesn't exist. Now that your baby has decided that he will not take bottle then he won't ( Smart boy indeed). Continue breastfeeding and your milk supply will increase, Eat daliya, oats, eggs, dry fruits, nuts, milk and milk products regularly. Drink 4 liters of water per day.