Annika goes to a physiotherapist (for other, unrelated problems), but when the physio found out that Annika used to spend time in the jolly jumper, she advised I stop, or at least decrease this. The main problem is that they can shorten a muscle in the baby's legs, hence the baby will learn to walk on tip toes. With Annika, I had to do some exercises, which involved banging her heel softly against the floor, whilst encouraging her to take some weight on it. It took a while, but she now stands flat footed!