Visitor Visa - B2

(1) If someone is on 5 years tourist visa can he/she can switch to student visa while his/her tourist visa extension is pending and his/her i-94 is going to expire Nov 25th 2015?

(2) If he/she gets refusal for tourist visa extension then are they going to cancel 5 years visa as well?

(3) If he/she does not get tourist visa extension after i-94(expiry date Nov 25th 2015) then will they consider as over stayed?

(4) If baby born in USA while on tourist visa is the immigration going to give tough time while couple is visit 2nd time to USA on same tourist visa with baby born in USA because someone told me that they can send back while saying your intention was baby birth in this country?

(5) If any couple spend almost 6 months in USA while on 5 years tourist visa then what is the best time for 2nd visit on same visa like how much time they should spend in their homeland?

(6)If someone has applied for visa extension while is on tourist visa while he has applied for visa extension if he leaves USA while application is in progress but he leaves after expiration of his i-94 but application is still pending and after he leaves he gets refusal for extension will he be considered as over stay?
waiting for expert opnions.
thanx