Just want to add something..At Neonatal Follow Up Clinic (where we go to have Lakai's development assessed) they gave us a sheet saying that door jumpers and jumparoos can be bad for preemies later on when they reach the stage of learning to walk. It can cause them to walk tip toed and cause their muscles to be tense down the backs of their legs.
That being said, they did also say when we question them..that a jumparoo with a pillow beneath their feet so they are never "tip toed" on the floor and their knees are bent (very important) is ok for short periods of time, like 15 mins tops.
Door jumpers are a complete NO. They cause so many issues with preemies, from back issues, to muscle (legs and torso) and can cause hip, knee and ankle joint issues.
And this is for all preemies, not just ones with serious health risks or were born very very early.
Just wanted to let you know, not trying to scare you...but this was a huge lecture for us..so if don't have follow up clinic you may never know..
I use one with Lakai and have seen no ill side affects so far. Im sure Archie will be the same, but it's good to know (I hope).