You could take the opportunity to dig a new pond - the spring rains may help to fill it. We recommend a minimum depth of 60cm (2ft) at the deepest point, to reduce the risk of the pond freezing to its full depth.
Gently sloping contours between the shallow and deep areas, and between the bank and the water, are more wildlife-friendly, and help to make marginal plantings appear natural.
Grille coverings (either simple meshes or bespoke features) can protect young children from accidents. The size of the mesh can be judged in order to prevent hazard, but to also allow access for wildlife, and to preserve the aesthetic charm of the pond.