Yes you can give homemade ragi porridge...
But introduce first foods to your baby like rice water, dal water,fruit purees along with bm or fm...

You can give normal milk by adding fruits or dryfruits powder as milkshakes which is healthy and tasty too...

Avoid sugar, instead add homemade palm jaggery syrup or honey or dates syrup...

See at this age not only milk,solids also play a major role in weight gain...

So include fruits, vegetables,green leafy,pulses,ragi, dry fruits powder,eggs,dairy products in baby's diet ...

You can also check on Google as mylittlemoppet or gkfooddiary it has many healthy weight gain recipes for babies and toddlers...

Avoid store bought cerelac,prepare homemade cerelac and give...

I think your baby might be bored with same food,so try to give some new foods...

Avoid packaged foods,maida products...

You can go with Pediasure or junior Horlicks...
Or
Sometimes even can try with simple homemade milkshakes like by adding fruits or dryfruits powder to milk...which is healthy and tasty...

Instead of sugar jus add homemade palm jaggery syrup or honey or dates syrup...

Khali pet usko 1 cup milk me 2 spoon pediasure day n night jar ur doh

I think he is not having enough sleep...
That might be the reason for tired ness...

Make him to sleep early ...
And let him play in the day time or study ...
He can take a nap of one hr in the day time also...

Keep a schedule maintain proper timings of food,sleep,study,playing...

Banana, apple, garlic, green vegetables, oats, onions, tomatoes, soyabean and many other are great options for prebiotics. Whatever is suitable for the particular age of the baby you could introduce that in small quantities in the diet. As far as formula milk is concerned you can give Aptamil it has prebiotics and helps in building immunity of the child as well.

Hiiiii

Sure

For four years kid you can give whatever you prepare at home...

Include fruits, vegetables,green leafy,dairy products, pulses, ragi, dry fruits,eggs in your baby's diet...

Jus avoid packaged foods, maida products...

You can also check on Google as mylittlemoppet or gkfooddiary it has many healthy recipes for babies and toddlers, hope it helps you...