Board book I introduced at 8 months ...

The sooner the better. I have given a board tab book to my daughter when she was 5 months

Board books you can introduce at 6 months or so as kids start recognising things but you can give use colourful objects to start with and tell about it and slowly give books. As such small kids tend to put everything in mouth so be safe

Go for soft book until ur baby is about one . Then start with; hard bound board books . Pls monitor ur child when u give a board book as they love putting books in their mouth .

As early as 4-5 months, board books with shapes,; colors and stuff can be introduced to develop recognition and familiarity.