1. Begin by preparing the papaya. Take the ripe papaya, peel off the skin, and carefully remove the seeds.
2. Cut the papaya flesh into small chunks to make it easier to puree.
3. Place the papaya chunks into a blender or food processor.
4. Add the whole milk to the blender with the papaya.
5. Blend the mixture on medium speed until it reaches a smooth, creamy consistency. If the puree is too thick, you can adjust the consistency by adding a little more milk.
6. Once blended, transfer the puree into a clean bowl, ensuring there are no lumps for easy feeding.
7. Allow the puree to cool slightly if warmed and serve immediately, or store it for later use.

Summary:
This creamy papaya and milk puree is a nutritious breakfast option for babies aged 4-10 months. Papaya is rich in vitamins and aids digestion, while milk provides essential nutrients for growth. Store any leftover puree in an airtight container in the refrigerator for up to 24 hours.

Possible Side Effects/Allergies:
It's essential to check for allergies as papaya can occasionally cause reactions in sensitive individuals. Always consult with a pediatrician before introducing new foods.