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Start fm milk.buy 2 pigeon bottle with sized of nipples,by age then4 5 brupps,hiccpuss for 30 40 mint .gap in NM n FM 2hr.

Yes

Hi give clean cotton cloth refrigrated one to chew to soothe baby's gums and pain too and prevent your baby from taking everythingin the mouth to prevent infectionsand diarrhea during teething

Second line is very light,better check after one week again for accurate result...

There is no problem... Most babies have this fear.

Yes weight is good...

By 5-6 months babies weight could be twice of the birth weight...
Your baby had already reached it...

Try giving some coloring books and check if he is able to color in it. If so nothing to worry.

Maybe he is not interested in writing. Don't pressurize him.

Babies usually start to see clearly after 2 months.... Till that time they have very poor vision.. Only if you are very close to their face they will make eye contact for few seconds...
They keep on staring ceiling or moving fans...
Once vision gets clear they start smiling, observing people..
Dnt worry your child is absolutely normal..

Hi give small feed frequently and take burp after every small feed and let your baby lie down on left lateral position to minimize the spitting after feed