18 Months to 3 Years
During the toddler years, a child's main bond is with her parents, so any major disruption in her home life can be difficult for her to accept and comprehend. What's more, kids this age are self-centered and may think they've caused their parents' breakup. They may cry and want more attention than usual, regress and return to thumb sucking, resist toilet training, have a fear of being abandoned, or have trouble going to sleep or sleeping alone at night.
How to ease the transition: If possible, parents should work together to develop normal, predictable routines that their child can easily follow. It's also important to spend quality time with your child and offer extra attention, and ask trusted friends and relatives to do the same. Discuss your child's feelings (if she's old enough to talk), read books together, and assure her that she's not responsible for the breakup.