Which position is contraindicated for an infant undergoing postural drainage?

The position that is contraindicated for an infant undergoing postural drainage is Trendelenburg. This position involves tilting the body so that the head is lower than the feet, which can lead to increased pressure on the diaphragm and lungs. For infants, this can be particularly problematic because their respiratory systems are still developing, making them more susceptible to complications such as aspiration or difficulty in breathing.

Postural drainage techniques aim to help clear mucus from the airways, and certain positions are chosen to facilitate this while ensuring the infant's safety. In contrast, positions like sitting upright, supine (lying on the back), and prone (lying on the stomach) can generally be used safely as they support effective drainage without compromising the infant's respiratory function.