Hi,
We bought a baby bjorn and didnt use it until dd could hold her head up well enough so her head wouldnt bob about every where when we walked. After that it as great...yes it did get really hot(for walking outside) but so handy when out shopping and she didnt want to be in the pram anymore. We would face her out so she could see everything but if we knew she was tired we would face her towards us so she could snooze. Used it up until she was 9kgs and look forward to using it again.