It seems like every day there’s a new app that makes its way onto the scene and while some are really useful, others just seem to be, well, a new app. However, if you are a parent or grandparent or an aunt or uncle who has a lot of children that you find yourself doing clothes shopping for, you’ll be both happy and relieved to know about . It’s an app that serves as a clothing predictor for children.

This is how it works: Pint Size takes the information as it relates to the current size and weight of a child that you shop for. Then it uses the data and formulas from both the Centers for Disease Control (CDC) and World Health Organization (WHO) in order to predict what the future size and weight of that child will be up until they turn the age of 20.

As if that is not already helpful enough, what Pint Size also does is match the predictions up with the sizes that are available at the (currently) 44 children’s clothing stores that are programmed into its system. So, say that you have a niece named Kate and currently she is 5. When you are ready to get Kate a new outfit for her 6th birthday, Pint Size will not just tell you what size to get, but it can also help you to find what will be a good fit for Kate based on the clothes at the stores that the app features. Pretty cool, right?

Aside from it taking out a lot of guesswork that comes with trying to guess a child’s size, there are other reasons why Pint Size is proving to be a smart app to download. For one thing, being that it does offer predictions of upcoming sizes that a child will wear, it supports those who like to shop smart by “buying up” (purchasing items that a child can wear two or three seasons later). Another bonus is that the app can be used in the United States, the U.K. and also in metric units in case you are on vacation and you see something that you would like to purchase. And still, another attractive feature is that it provides you with the ability to share the information that you have stored via email, Facebook or text. You can even collect photos of the child in your life in an online photo album so that you can share their growth history.

Already consumers are singing the app’s praises. Mostly because Pint Size makes it easier for them to shop at multiple stores without having to spend a lot of time figuring out if the size will be right (which could make it the perfect app for a parent getting a prom dress 2013 for their teen daughter). And when you look at it that way, you can do Christmas shopping in the late summer and early fall, when the sales are great and you don’t have to worry about if you got the right sweater or pair of pants.

Honestly, some apps you can honestly pass on, but if you have a special child in your life, Pint Size would definitely not be one of them. And for only $2.99 at the Apple Store, why would you want to? It makes shopping easier and we all could use a little more of that.