LO is 5.5 months & can sit lightly assisted (like leaning against something) and has started to be able to sit up on her own by supporting herself with one hand while playing with the other. Last night she sat up unassisted & without "tripoding" for maybe 5-10 seconds. Clearly she has a ways to go to master sitting but she is on her way.

Anyway, for the sake of the baby book, when do you "count" it?