Be careful - babies and shopping carts

According to the American Academy of Pediatrics (AAP), in 2005, more than 24,000 children were treated in U.S. hospital emergency rooms for shopping cart-related injuries. Most of these injuries occurred when a child fell from a shopping cart, the cart tipped over, the child became entrapped in the cart, or the child fell while riding on the outside of the cart.
The AAP suggests that parents who choose to place a child in a shopping cart should never:
• Leave a child alone in a shopping cart.
• Allow a child to stand-up in a shopping cart.
• Place an infant carrier on top of the shopping cart.
• Allow a child to ride in the basket.
• Allow a child to ride on the outside of a cart.
• Allow an older child to climb on the cart or push the cart with another child inside.

So, what to do with the infant when shopping? Better stick with the stroller or a frame that holds your car seat. I know this makes it hard to hold the shopping items, but your baby will be safer than with the baby seat perched atop the shopping cart. In an ideal world, you take someone shopping with you to push one of the carts if you can't leave your child at home with a sitter. The one pictured was at Amazon.com for $56.50 Graco SnugRider Infant Car Seat Stroller Frame

As the baby gets older you can get a shopping cart cover to pad the "seat" built into the cart. You can see an example here.