My 5 months old on mix feed. I give her friso cereal and FM (ratio 2:3 // 200 ml, 3 times a day) with in between BM/FM where necessary. You can start weaning off slowly with puree (subject to if you consult dr/nurse) You can get those from supermarket. There are some mummies I knw that give as early as 5 months home made porridge/cereal. But this depend on individual. For my first child I start exactly 6 months, for my second I start at 5 months. However no porridge, just mix feed for now.