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.