Heirloom baby gifts

In October, my sister-in-law and brother-in-law are welcoming their first baby, a sweet little girl. To say our family is over the moon would be an understatement. We already have two nephews and one niece, but this is the first baby girl in the family that I get to spoil (my oldest niece was born a few years before I was a part of the fam, so I missed her baby phase). 

Of course, Aunt Nicole has been buying all sorts of little things for baby C. She's gotten a book (of course), a sweet onesie, a bib...the list goes on. However, I've been on the lookout for something that I could pass onto baby C that her mom could cherish as much as she could, and something that could be a keepsake of sorts for years to come. An heirloom.