My son just turned 6 months and I observed that he loves eating avocadoes. According to http://wholesomebabyfood.momtastic.com/avocadobabyfoodrecipes.htm, avocado makes a great first food for baby due to its texture and creaminess; an extra bonus is that avocado is full or “good” fats and has a high nutrient content. Maybe you can try it to your baby. He also loves eating squash, carrots and apples. :)
Magbasa pa