Cameron English got comfortable on the cushioned green exam table as her 3-year-old son and 5-year-old daughter played nearby. Initially, as midwife Carolyn Greenfield swept a monitor over English’s pregnant belly, there was only an indistinct swoosh. But before long, the instrument found and amplified a distinctive, quick double thump. English was all smiles, hearing her baby’s heartbeat for the first time. After English’s first three children were born in a hospital, she had her fourth child at home in 2020, attended by Greenfield, a certified professional midwife.