hey i wouldn't worry bout that
my wee girl is 4months and she weights 8.4kg and is 64cm,
i don't know if thats short or tall but all kids lose their weight when they start to crawl or walk and by the time they are all 1-2yrs it wouldn't make a diffrences <span class="emoticon smile">smile</span>
My DD is now 7 and a half months and now weighs 8.2kg and 70cm. So she's actually lost weight since I last weighed her. But she has been using her walker alot and trying to crawl around alot too. She's still a healthy weight so I'm not worried, but am taking her to the clinic next week just to make sure it's ok.