Your baby's yawns have, until this point occurred only occasionally as a single event, but they are now becoming more repetitive, with several yawns following one another. Your baby's swallowing reflexes were developed at 25 weeks but still need to become much better coordinated.
The baby's breathing movements are vital for the normal development of the lung tissue. Your baby does not breathe amniotic fluid into her lungs; The lungs are filled with fluid produced by the lung tissue itself, and as breathing movements are practiced, small amounts are expelled. With each breath, the diaphragm pushes down, and the chest wall moves in as the larynx relaxes, allowing fluid to escape. Only a tiny proportion (0.5 percent) of the fluid in the lung escapes with each breath. This compares to a fifth (20 percent) of the air in the lungs moving in and out with each breathing movement.
Your baby has been breathing for some weeks, but the pattern up until now has been somewhat random. Now, the baby's breathing patterns start to reflect her better developed sleep-wake and becomes more rhythmical.