What is the first step in safely picking up an infant?

When picking up an infant, the first step should always be to support their body correctly to ensure their safety and comfort. Sliding both hands under the infant's underarms allows for proper support of their upper body and head, which is crucial since an infant's head is relatively large and heavy compared to their body. This action provides a stable grip and ensures that the infant feels secure as they are lifted.

Supporting the underarms also puts the caregiver in a strong position to lift the infant without straining their back, and it allows for the infant's head to be cradled by the caregiver's arm while providing security and comfort. This method helps in preventing any injury to the infant, as their neck muscles are not fully developed and require support during movement.