Hi

Esther Is correct - typically developing children do reach their milestones at different ages, and hypermobile infants tend to be later than the norms.

However, the fact that the baby has mild atrophy suggests that she may need some extra help in developing the basic skills.

The tendency to lift the legs up is called "sitting on air" and is associated with something called "dissociation of maturation" (See Dissociation of motor maturation. [J Child Neurol. 2003] - PubMed result)

Passive standing is not going to develop the strength needed for standing.

You need to get this baby pulling herself up into standing. This is easier from a position with the baby sitting on a low step in front of a small table - get her to stand up from this position. If her legs tend to flop out to the side, you may need to help her to keep them in line with her hips by holding her thighs straight and keeping her feet flat on the floor.

Also let her stand on her knees in front of a low step - and get her moving from sitting to kneeling, in preparation for getting up into standing.

You will find many of these activities described in detail at Babies and toddlers with low muscle tone and joint hypermobility | skillsforaction.com.

(These pages are going to be updated in April with video clips showing the different activities. If you would like to receive news of the updates, please subscribe as a user to receive the skillsforaction.com newsletter.)

Pam