OXO Tot Baby Blocks give homemade baby food the same care you put into preparing it. Easily portion, store, freeze, heat, and serve the meals you've cooked especially for your baby using these containers. Each container fits into the freezing tray to keep your portions organized. Multiple trays can be stacked to save space in the freezer. On the go? The containers are airtight, watertight and leak-proof. Clear lids and bodies allow you to see whether you're grabbing sweet potatoes or peas for baby, and convenient measurement markings make portioning a breeze. Pop one into your bag for simple defrosting and feeding when you're out and about with your tot. An easy-open, easy-shut lid makes the Baby Blocks a carefree choice. The 2 ounce size is perfect for children in the early feeding stages, and the 4 ounce size is great for a growing appetite. Both sizes are appropriate for snacks, fruits and other foods as your child grows and moves away from pureed baby food.