DD is 20 months she loves walking, I have a 45 minute walk to school (would be longer if DD is walking) but it is on a very steep hill, dd has walked up the hill but not both ways. But as she would really enjoy it I want to let her walk but I am in the early stages of SPD now her walking would also help me but if she cant do it I could only carry her halfway back up at most as it would be painful. Is there any way too much exercize/walking could harm her developing bones/joints? Sorry if this is a very stupid question. So walk or pram?