When i first started to let DS out of the pram he was around 2years (DD a newborn) and i used one of the navy harness and leads and found it great. Especially when walking near roads or in shops where i didnt want him to run off or pull the shelves and their contents down. I still made it a rule that he held the pram and after he got used to it, id let him walk without the lead. Since then and even now he continues to walk and hold the pram the majority of the time. Has worked well for us.