Hi that's very Normal in few babies, don't worry

Sons chest mam,he is skinny ..now started to gain weight

Ys it's ok.encourage her more to speak. Teach fruits name & then ask fruits name , veggie names etctalk to her small things & read her story books even though she does nt understand stories. Sing for her rhymes etc

Yes it's normal.

Yes good weight

Enquire in other schools too about age needed for lkg admission if u r confused totally.personally I feel u can Admit her in lkg next year so that she is more comfortable in school & now at home u give basic knowledge about alphabets colours nmbrs etc..

R u using diapers for baby in daytime?Babies should pass urine at least 3 or 4 times .Entire day no pee is not good.give lots of water to baby.

Wht is present weight?

Don't worry.Is baby ok now & walking with support?

Animal milk is not good before age.According to birth weight present weight is good.Avoid cerelac & give home made semi solids & solids .like idli, ragi , boiled mashed veggies, fruit purees, extra soft rice with ghee etc