DD walked at 18 months with the help of Physio exercises. She is the least affected. She had a slight speech delay, due to poor oral motor control, and was late developing a dominant hand, which affected her writing for a while.
DS2 is my worst affected, basically he is as bad as you can be with it, in a Wheelchair till 5yo, took his first step at 3y7mo, it affects his respiratory system (but that was very apparent by the time he was just 5 months old, so don't let that worry you if your DD hasn't had issues by 1yo!), it affects his bowel motility, it affected his speech, he had a severe speech delay as his oral motor control was affected, he has kyphosis in his spine, plantar fasciitis, the list goes on and on. he is now 10yo and sees Physio, OT, orthopaedic consultant, respiratory consultant, orthotics for orthotic boots and orthotic insoles, rheumatologist, speech therapist...I've probably missed some!
His issues were VERY apparent at birth though, as he was so severely affected that he was unable to suck, and had to be syringe/spoon fed for quite a while.
So PLEASE don't let his issues worry you, if your DD was that severe, you would know that already!!
DS3 is moderately affected - though he walked at 14 months, with the help of the Physio exercises I'm now proficient in
. He has Speech delay and requires orthotic inserts, but he runs, climbs, and is generally into everything as much as your next nearly 3yo!
It really is a curve as to how badly affected they are. You might find that there's no real issue other than a natural aptitude for gymnastics (something like 70% of Olympic gymnasts have mild-moderate hypermobility!)