The 4th trimester is a critical 12-week period after birth when moms recover physically and emotionally while babies adjust to life outside the womb, making it an essential phase of parenthood.

Medically reviewed by Teja Dyamenahalli, MD, MPH, FAAP Whether you’re a new parent or a seasoned pro, you probably spend a lot of time thinking about your baby’s sleep. You may have even wondered if ...