Should i wake up my lo who is 2 months plus to feed? Coz sometimes he will sleep thru out the night which like 7 to 8 hours.

If it is night time don't wake him up! It is good that he can sleep through the night already. Actually babies are like adults they don't need to wake up in the middle of the night to eat in order to grow. The old folks always say babies need more sleep to grow, I think this is true to an extent. If the total amount of milk he drinks is in the acceptable range for his weight I don't think you need to walk him up on purpose to drink. Babies need about 150ml-200ml for per kg of their weight so you can calculate what's the range for him