I've been told 6 months/ 4 months is the norm. Providing ds stays on his own centile that he's carved out he'll be about 7-8 months when he doubles his, probably 7 has he's speeded up a little. This doesn't seem that far off 6 months to me. He's abovethe 98th centile for length so is clearly growing and is now tracking 9th for weight quite steadily without further drops.
Does anyone else have experience of a baby who's a little slower to double. It's the latest bee in the hv's bonnet, though all she's said is 'he won't double his birthweight in time'. I don't know what 'time' is!