As I mentioned in another post, I just signed up for Zulily yesterday and today they're having a Stride Rite sale. When DH and I took H back in January to get his feet sized for his first pair of shoes (at 12 months old), we found out he was a size 5.5 wide. We just bought him a brand new pair of sandals from Target this past weekend in size 6. I would like to have another pair of shoes for H to grow into a little. The size 5.5 W shoes aren't uncomfortable but he's really close to the end. They've lasted about four months, are barely used and we're keeping them in case Em can use them. Should I go ahead and get him a size 6 or skip to a size 6.5?

How fast do little feet grow when they hit 16 months? He seems pretty set in his other clothes, sizing wise. Are feet similar?