Which one of the following children is at most risk for sudden infant death syndrome (SIDS)? 1. Infant who is 3 months old. 2. 2-year-old who has apnea lasting up to 5 seconds. 3. First-born child...

Which one of the following children is at most risk for sudden infant death syndrome (SIDS)?

1. Infant who is 3 months old.

2. 2-year-old who has apnea lasting up to 5 seconds.

3. First-born child whose parents are in their early forties.

 4. 6-month-old who has had two bouts of pneumonia.