When purchasing baby cribs, safety should be the first consideration. Make sure the cribs you choose are safety tested, meet relevant safety standards, and have no defects that could harm the baby. 

In addition, consider the size and specifications of the cribs to make sure they can accommodate the baby's weight and height and are safe and secure. Furthermore, consider the comfort of the cribs, making sure the sides are wide enough, the surface is soft enough, and the support is moderate enough to ensure the baby can sleep soundly. Lastly, make sure to choose a safe and reliable baby crib to ensure the safety of the baby.