This lift-the-flap board book has stood the test of time with my four kids. Although mostly my baby boys loved it (it’s all toy vehicles), my girls liked it too. It’s a nice chunky book that little hands can hold and lift the flaps to reveal a surprise on every page. It held their interest from age 2 months to about 3 years.
Baby: Beep! Beep! (by DK Publishing)