Wow, I love reading about big healthy breastfed babes!
Did your dr say anything? My sister has a huge breastfed baby (he doubled birthweight in 2 months) and the dr tried to make her start rice cereal at 4 months so he would "slim down". Apparently her dr hadn't read any of the research suggesting that starting solids too soon (rice cereal no less, and spoon fed to top it!) can actually lead to obesity later in life... But, she's smart, she politely declined and waited until he was trying to finger feed himself and then let him take the lead on eating solids.
My first baby was big, but not nearly this big

My second baby is *small* (started at over 8 pounds, but has special needs, so we struggle for every ounce of weight) At 9 months old he's only now 17 pounds!!
If anyone comments to you about his size, somehow incorporate breastfeeding into your answer..."how old is he?" "4 months" "4 months!!! He's huge!!" "Yep, he sure likes his mommy's milk, it's obviously doing its job." Or something like that.
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