Fill a pot with a few inches of water and place a steamer basket inside. Make sure the water does not touch the basket.
Wash and cut the cauliflower into small florets. Add 1 cup of cauliflower to the steamer basket, cover, and steam over medium heat for 5 minutes.
Add 1/2 cup of frozen peas to the basket. Cover and steam for another 5 minutes, or until the peas are fully cooked and the cauliflower is very tender and easily mashed with a fork.
Allow the vegetables to cool slightly, then transfer them to a blender or food processor with the fresh dill.Blend until smooth, adding a little water as needed to reach your desired consistency. You can also use prepared baby formula or breast milk once the vegetables have cooled. Check the consistency and temperature before serving. Adjust the texture to suit your baby's developmental stage.