As Diana mentioned, babies would have doubled their birth weight by the time their 6 months. Here's a growth chart that you might want to refer to: Birth to 36 months: Boys, Length-for-age and Weight-for-age percentiles My son is 9.5kg at 6.5 months old and is in the 90th percentile.
At 6 months old, Weight for baby boy: 16.2 - 18.8 pounds Weight for baby girl: 14.8 - 17.5 pounds http://www.babycenter.com/0_your-childs-size-and-growth-timeline_10357633.bc By age 6 months, most babies have doubled their birth weight.
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I don't remember, but when my daughter was 7 months old she was 7kg
thanks