1. The side rail should be fixed and not adjustable. For safety reasons, the US Consumer Product Safety Commission prohibits the sale of adjustable side rail cribs. 2. The distance between the slats must not exceed 6 cm to protect the infant's head from being tampered with by the baby and sandwiching the head between the slats 3. The crib corner posts must be flush headboards and pedals and maintain a certain height - more than 16 inches (41 cm). Otherwise there is a danger of choking your baby 4. Select the most solid mattress you can find. Do not rely on the manufacturer's label, which is very important. Because soft mattresses can easily cause sudden infant death syndrome. 5. Make sure the mattress is in close contact with the crib. Always leave gaps between the mattresses and cribs that slide the baby off, and buy mattresses of the right size to ensure a snug fit. Don't forget to remove the new plastic packaging on the outside of the mattress. 6. Carefully use cribs with extra care. This type of bed may have too much space between the slats, or in the headboard and pedals are very sophisticated, but this is easy to make the baby's head potentially harmed. Before 1978 it was possible that most of the cribs contained lead, and that many generations of families had been recycling the same crib for several generations. This practice was inadequate. It is best to choose a new non-toxic harmless crib for your baby. Light Up World Globe,Illuminated Kids Globe,Illuminated World Globe,Illuminated Rotating Globe Ningbo Holly Arts & Crafts Co.,Ltd. , https://www.world-globe.com