In this study, to establish a system unique to our hospital, an awareness survey of physical therapists was conducted using a newly developed form to investigate the degree of anxiety about, and participation in supporting, pediatric patients with a developmental disorder, managing patients’ families, and interdisciplinary cooperative activities. The level of anxiety and the degree of participation were evaluated using a visual analog scale. The Mann-Whitney U test was used to compare cooperative activities with different professionals. The results showed that 20 (90.9%) of the physical therapists were anxious about supporting and handling pediatric patients with a developmental disorder and their families. No significant difference in the degree of anxiety was observed among different professionals, but the highest anxiety was observed when working in cooperation with physicians (Dr), followed by clinical psychotherapists (CP), nurses (Ns), medical social workers (MSW), occupational therapists (OT), and then speech therapists (ST). Physical therapists cooperated most frequently with Dr, followed by Ns, OT, MSW, ST, and then CP, with a significant difference between Dr and CP. The findings of this study, showing current awareness and challenges related to pediatric patients with a developmental disorder, provide information that is fundamental for the establishment of a system unique to our hospital.