This is an example of the fit of standard size with an older toddler. This full buckle is made from a dyed hemp indio and paired with a Michael Miller - Fantasy Forest. The carrier also features a wrap scrap rainbow tree appliqued on the inside of the pixie hood. Standard size is still a good fit for my toddler. it should fit him well until at least 3. Taller toddlers would grow out of it sooner - probably close to 2 and a half. My toddler is around 50th percentile for height and will be two and a half in two weeks. The carrier is still knee to knee on him. The height is perfect for him as it is easy for him to have his arms out which he prefers. He can still put his arms in if he likes but I don't have a photos of that as he only likes to do that if he is sleepy (and even then not always). When he is arms in the very top of the curved headrest rests on the nape of his neck and the sides of the carrier are an inch or two below the top of his shoulders so it still provides good back support.
Another photo of toddler snoozing - 2 years, 11 months. Standard size can last a long time if you have an average sized toddler or smaller.
Knee to knee support is still good at almost 3.
I love to sew. I have five curious and active kids who keep me busy!