This was a pilot study assessing the technique in this population. The study was conducted with 8 stable premature infants admitted in the Neonatal Intensive Care Unit (ICU) from Hospital Luterano de Porto Alegre. Physiological and behavioral parameters were assessed by Brazelton's neonatal behavior assessment scale, and the pain was evaluated by NFCS scale. The mean of Brazelton's scale was reduced after the procedures from 5,88 ± 0.35 to 1,38 ± 0.74, p < 0.001. The score in pain assessment scale was reduced from 5,38 ± 0.91 to 0.25 ± 0.46, p < 0.001 after intervention. The study suggests that aquatic physical therapy could be a simple and effective method to reduce pain and stress in premature infants admitted in the neonatal ICU.