Hi there. There is a height and weight chart in the health booklet which is the. One that singapore uses. Just to note that there is no must put on how much weight. Kind o thing but that baby generally gaining height and weight according to the percentile that he is in. There will be some ups and downs, as long as its not a drastic drop like 75% to 25% or the other way round (a large increase) then all is fine. At 7 months a lot of factors coe into play. Depends on how well baby taking solids, teething, how much milk and how active (if they are crawling a lot already). Generally when they start crawling, the weight will stagnant or gain v slowly