4 months

For those who’s little ones hit four months, did you guys start solids or cereal?

My pediatrician at our last visit had recommended starting iron fortified cereals as their iron levels deplete. Then at 5 months introducing veggies and then fruits at 6 months. Of course there is so much content and information online. I personally would like to start purées and stuff once he seems ready to do so (showing interest in food, complete head control, can sit up on his own, grabbing things well). I am just so nervous. Just wanted to see if anyone has tried it so far and what is their experience so far.