I am the mother of twins, but as ours are a boy-girl pair, I never had your problem. Since your girls are identical, it is unusual to find a two-inch disparity in height at their age. It may be that they are not truly identical, and other differences may appear in time.
If they are identical, this height differential may give you the opportunity many parents of twins long for—a basis for helping them establish their own identity and for being accepted by other people as two separate individuals, rather than clones. Here’s your chance to dress them differently and to help other people tell them apart.
As for the short one’s feelings about being smaller, you can find many ways to reassure her that people vary in height, that some are tall and some are short. Perhaps you have a sister who is taller than you are that you can use as an example. Don’t hesitate to introduce her to old sayings, like, “Good things come in small packages.” Point out other friends she might have who are small. Offer her some reassurance, but don’t pass up this opportunity to help your girls differentiate themselves from one another.
Our parenting advice is given as suggestions only. We recommend you also consult your healthcare provider, and urge you to contact them immediately if your question is urgent or about a medical condition.