Gracie is 10.5 months, she was in first size up to about a month, 0-3 from 1m-4m, 3-6 from 4m to 7m, and 6-9 from 7m up to now. She's starting to grow out of her sleepsuits and vests, but still has lots of room in actual clothes. I tried 9-12 stuff on her recently and it drowned her.
I'm pretty gutted as we swapped all her small sized stuff which was gifted to her and swapped it for bigger sizes, she's pretty much kitted out til she is 2, but now that she is behind on her sizes I don't think things suit the season! She's 25-50th centile for weight and 75-91st centile for length so I have no idea why she doesn't fit into 9-12 months yet. I don't think she will even be into most things by a year, her 6-9 month stuff is starting to look worn. She's been in it for over 3.5 months now and we let her self feed - enough said!
She is still wearing really small cardigans which fitted when she was newborn. Not sure how that works!