Hi, my mum in law will soon be looking after our 6 month old for a day a week when I'm back at work. She has a bad back and finds it difficult to bend over to lift little one in/ out if a travel cot. I'm worriedabout getting a height adjusting one, as how long til they can pull themselves up and so risk climbing/ falling out? If this is ok for a while any ideas where I can get one as have seen one but was really expensive!