I just had our two-year old paint this present for her grand father, using some wooden hearts. I pre-drilled the hearts so that she could string them after she painted them. I originally painted numbers on them, because I thought we could make it into and additional educational activity by stringing the hearts on in order, but those numbers we quickly painted over! In the end, I used baker's twine and a large needle, and guided her as she strung all the hearts onto the string. I highly recommend this activity! Check out our undone shop for supplies.