Factors Associated With Infant Circadian Rhythm, Growth, and Temperament

The goal of this observational study is to learn about the role of modifiable factors affecting infant circadian rhythm so that recommendations can be made for better health outcomes for the mother and infant. The main questions it aims to answer are: 1. What is the association of prenatal and postnatal maternal circadian clock with infant's circadian clock at 3 months? 2. What is the association of birth outcomes, maternal factors, and environmental factors with infant circadian clock at 3 months? 3. What is the role of infant circadian clock on infant growth and temperament at 6 months of age? Participants will complete a set of questionnaires and provide saliva samples during third trimester of pregnancy and at 3 months after birth of infant.