Grate the bananas if your baby is not big enough to chew it properly. Otherwise you can slice it and then mash it a bit. These days I don't grate the bananas as Devansh can chew the banana chunks properly. (You can use one big regular banana if the elaichi ones are not available.)

Add 2-3 measures (the spoon that comes with the packet) to the banana. (You can use any other cereal of your choice if you don't have the wheat and apple cereal with you. But I would recommend that you use some organic cereal.)

Add about 1 cup of milk and mix it well. And banana with wheat and apple cereal is ready to be served. Please ensure that your baby has this within half an hour of making it. Don't store any leftover for future use. Either eat it yourself (it doesn't taste too bad :p) or throw it away.

Note: I did not add cow/buffalo milk to Devansh's diet till he turned one. If you have introduced it in your baby's diet, you can start giving your child this banana mixed with cereal after ensuring s/he can digest both these ingredients separately. If you haven't started giving cow/buffalo milk to your baby yet, you can try adding water in the cereal first and then adding mashed bananas to the mixture.