Baby Size Chart – Sizing chart for making baby clothes.

Baby Size Chart

When I was first starting out designing baby items, I was bewildered by all the different sizing charts that popped up in a Google search. And there was so much variation between them! I finally realized that this was because these size charts were all made by individual brands, who all make up their own rules about sizing. Nothing wrong with that of course, but it wasn’t going to help me find a  reliable standard for designing clothing that was accurately sized.

What I needed were the actual weight and measurements that the average infant had at various ages. I eventually found a couple of sites that offered this information and began building my own sizing chart based on the best information both sites had to offer. Eventually I came up with this chart.

How it Works

This baby size chart gives various measurements which will be helpful when designing your own sewing, crochet or knitting patterns. Since this chart is based on the actual average weight and measurements of the infant at various ages, no ease has been added in. Most clothing needs a bit of ease for comfortable to wear so you will want to add your own amount of ease to these measurements. About 1-2 inches of ease seems to work well for most items. This is especially true if your pattern is crochet or knit because these fabrics tend to have a fair amount of stretch. This makes them more forgiving. Sewn items may need 2 or more inches of ease. Any type of pattern for sleepers and pajamas may need 2 or more inches of ease to be extra comfy and avoid binding as the baby sleeps.

Sizes Included

Preemie, Newborn, 0-3 Months, 3-6 Months, 6-12 Months, 12-18 Months and 18-24 Months.


Click photo to view PDF

Baby Size Chart

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  1. Stephanie


    Thank you for the wonderful charts you have for download. I wanted to let you know on this one, the download option is not working. I tried to click the photo, but nothing happens? I doesn’t go to a PDF like your other charts.

    1. Brandie K. (Post author)

      Hi Stephanie,
      Thank you for bringing this to my attention! It should be working now.
      Have a great day!

  2. mary

    this site is so helpful I’s trying to make for hats for xmas sizes vary a great deal Thanks so much


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