The goal of this clinical trial is to compare, in healthy preterm babies, 9 doses of dorsal mechanical stimuli, in order to answer: * if there is a dose of dorsal mechanical stimuli that improves the basal respiration. Participants will be stimulated through a cotton shirt for one minute with each dose, while respiratory measures will be taken through a nasobuccal mask, slightly tightened by the investigator staff. All time, babies are going to be monitored and assessing that they are comfortable.
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Comparison of mean of Tidal Volume(TV) between the doses of dorsal mechanical stimuli
Timeframe: 1 minute for each intervention ( dose)
Comparison of mean of Minute Ventilation (MV) between the doses of dorsal mechanical stimuli
Timeframe: 1 minute for each intervention ( dose)