u can give avacado to your child,  make a combo with banana  ... though start with easier and digestable things first ...then slowly move on to  this fruit...

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Yes dear..you can feed avocado to him..when you introduce it make sure you don't introduce any other new food for the next three days just to be sure of any reaction of avocado on the baby..also I am sharing some useful links about what can you feed your baby initially while weaning..