This style of sunglasses works well as it's a larger lense and a curved frame that hugs the baby's face: the baby has maximum visibility with minimal sunlight coming in around the frame. My baby didn't like them at first, but when we put them on in the bright sunlight, and she realized that she was suddenly able to see, she was happy to keep them on (we were outside for probably an hour and she never tried to remove them again). We have a very big 5-month-old, and the glasses fit her well on the perfectly-aligned-velcro size, which means they could have fit a couple of months ago on a smaller alignment, and they'll definitely fit for several more months if we adjust larger. They seem well made and durable - we would buy again.