I recommend Bobas Clinic in Jung-dong, Giheung-gu, Yongin.

Located in Dongbaek, this is a rehabilitation center for children. They offer a variety of treatments, including speech therapy, occupational therapy, physical therapy, music therapy, and art therapy. Children with developmental delays and those requiring a variety of rehabilitation therapies are welcome here. The therapists are all friendly and skilled. Their hope is for all children to be healthy and free from illness.

Please don't get sick, babies...