Lullaby is an app designed to support sleep training and night crying improvement for sleep-deprived moms and dads with babies. It offers helpful resources for childcare, including doctor-supervised knowledge about baby sleep and personalized sleep schedules based on each baby's age.

The key features of Lullaby include:

1. Sleep training supervised by Dr. Mariko Morita, a mom who graduated from the University of Tokyo School of Medicine and has knowledge in pediatric sleep.

2. Daily delivery of essential information tailored to each baby's age, making it easy for busy parents to find the information they need.

3. Daily delivery of optimal sleep schedules for babies based on real-time sleep patterns, offering adaptive schedules.

Lullaby also introduces "nen-tore," a training method for babies. It involves creating a daily routine that fits each baby's growth, ensuring an ideal sleep environment, and learning techniques to help babies sleep better. This training aims to support babies (approximately from 6 months old) in sleeping through the night independently.

While the training may not be easy, it is a gift of long-lasting quality sleep for babies. Lullaby's effectiveness is backed by scientific research, and it has received positive feedback from 99% of users who participated in user testing.

Lullaby is highly recommended for parents who are struggling with sleep training, night crying, or want to learn more about baby sleep. It can be used in conjunction with childcare record apps to enhance sleep training and track progress.