Some may caution against making your own carrots at home due to issues with nitrates. However, the solution to avoiding any contamination is to avoid using the steaming liquid when pureeing carrots.
Place a steamer basket in your sauce pan and fill with water until the water line lies just below the basket. Place the sauce pan over a high heat and bring to a boil. Place the carrots in the sauce pan and cover. Cook until the carrots are very soft. Remove from heat.
Discard the cooking liquid and place the carrots in a Cuisinart or food mill. Puree. Fill individual baby food containers with carrots and freeze until needed.
To serve remove a container from the freezer and defrost in the fridge. Before serving, mix with breast milk or formula until it’s quite soupy. As the baby enjoys carrots more and more, reduce the amount of breast milk gradually until it’s no longer necessary.