However, it can illustrate how vulnerable children can be if left unaided by their elders, especially parents. Jack and Jill would not have fallen down if their parents had been around to help them get a pail of water. Or better still, to advise them to get water at the bottom of the hill and not on top of it. Kids need parents to shepherd them during their formative years, especially in the area of health.
On the other hand, parents can't take care of their children's health by themselves. They need the regular assistance of pediatricians to provide the same. This includes all stages of their development starting from the womb to newly-born and various periods of growing up.
Indeed, Jack and Jill would have been stronger to fetch a pail of water if their parents had provided them with pediatricians to ensure their proper health development. They most certainly would've avoided falling down that hill.