I believe that everything in moderation is fine, use your common sense and don't allow your baby to exceed their limits. Babywalkers have been used for many years and if there were any real disadvantages with them they would not sell. I had a baby walker when I was 4 months and my mum tells me I loved it and was always in it, I was walking at 8 1/2 months on my own and have never had any issues with my development. My bones/muscles/tendons are all fine and I was always a very sporty child. I would like to get a baby walker for my 4 month old and have heard that the Mothercare Little Circus Baby Walker is good but not sure if it is any good on carpets? Can anyone advise??