6 month weight

Rubi

So we Just had his 6 month check up and my son weighed in at 15 pounds. He’s now at the 7th percentile. His dr wasn’t concerned but I was wondering if that weight is normal for a 6 month old. He was at the 13th percentile on his 4 month check up and now dropped to 7. Did anyone go through this? He is an EBF baby.