Personalized I'm Three Years Old with Dog and Mouse Baby Bib. Celebrate your birthday with Dog and Mouse, the unlikely best friends from the children's book "Dog and Mouse" by Michelle Nelson-Schmidt. I'm Three Years Old with Dog and Mouse Baby Bib - White and Black, perfect for young readers, helpers, and great friends on their birthday. Our Baby Bib is rated high in convenience and durability and with a variety of fashionable colors, your baby can be trendy. Mix and match to any outfit. 100% cotton ring spun combed heather colors are cotton-poly. Width 7.75", Length 11.75"