Dr. Linda Acredolo and Dr. Susan Goodwyn are the doctor-moms who conducted the ground-breaking research on signing with babies that started a revolution in infant communication and inspired their best-selling book for parents, Baby Signs: How To Talk With Your Baby Before Your Baby Can Talk (now in its 3rd edition). Continuing their shared passion for helping parents and professionals benefit from the latest child development research, these child development experts have also authored two other parenting classics, Baby Minds: Brain-Building Games Your Baby Will Love and Baby Hearts: Giving Your Child an Emotional Head Start.