These super cute books on Alphabets and Animals were the very first books I introduced to Shaarav at around 9 months. Shaarav's maasi Swati brought these for him. The books have such cute and adorable illustrations that they caught little Shaarav's attention immediately making him interested in books. They engaged Shaarav's attention and made learning fun for him aiding image-word recognition. And in just a couple of months time even before he was one year old he could point at them when asked to. At 14 months he could turn through the pages and find them. Now when Shaarav knows his ABCD we still go back to these books every now and then.
If you are going to introduce books to your child for the first time these books are the safest bet and can be introduced as early as 6 months of age.