Baby Chilli All Together Pockets come in three sizes for the following weight categories.

Small         3.5-6kgs

Medium      6-10kgs

Large         9-18kgs

The fit is small so if unsure size up not down. 

These sizing ranges are a guide only.  Each baby is a different build and therefore will fit differently.  For a chubby legged baby over 10 months a large might be a good fit.