What's the average weight for a 7-m.o? I believe that my LO is under weight at 6.5 kls so we're really trying hard to breastfeed her more plus lugaw and vitamins.

I'll assume that your baby is a girl because you mentioned "her" in your post. If she's exclusively breastfed, normal weight is between 6-9.8 kilos. See attached chart for reference. However, it is best to double check with your pediatrician as well because they can give you the best advice for your baby.

same here my baby girl is 6.5 at 7 mos. hays kinda worried

Is your LO a girl or a boy? Exclusively breastfeeding?