The phrase "to soothe an infant" means to comfort or calm a baby.
Sentences with «to soothe an infant»
They want the padding and a full sized chair to relax in while soothing their infant. (babycomfortauthority.com)
Use this «S» only for soothing your infant. (babycenter.com)
For example, parents have been successfully taught how to manage irritable, hard - to - soothe infants so that such children can develop positive coping strategies and secure attachments with their caregivers. (child-encyclopedia.com)