Choking hazard list

The choking hazard list is based on the texture of the food, NOT the size of the food. Avoid these foods until they are at least 4 years of age: hot dogs, nuts and seeds, chunks of cheese or meat, whole grapes, hard gooey or sticky candy, popcorn, chunks of peanut butter, raw vegetables, raisins and chewing gum.
From: A Child grows in brooklyn.com

Mattress warnings

Use a safe crib with a snug fitting mattress that cannot get pulled away from the corners. You should not be able to fit more than two fingers between the edge of the mattress and the crib.

From: ParentingToddlers.com