At this age, children are extending and building their emotional attachment. It is also a period of rapid development in areas such as language and memory and they will be experimenting with touch and sound and will have begun to walk.
It's important that the bonds between the child and its parents are strengthened through regular time with each. Wherever possible, children should see each parent at least every three days. The time spent with each parent can increase at this stage in the child's development and overnight stays will work fine.
Try a couple of non consecutive nights a week plus some longer time at the weekend. Don't forget to make sure that your toddler has all the important things in their life with them at all times - that means teddies, comfort blankets and other essentials.