Our GD was 22 months before she walked, hey nursery were concerned and had suggested there was a physical problem.
Our daughter and husband were very concerned.
She came to stay with us for a week as her parents were both away with work, we took her to a soft play for three consecutive days, on day two she walked and day three she was running and jumping.
Our daughter cried when she received the video of her first steps!
A quote for those blessed with a spouse:


