The infant should have six wet diapers daily.

Choice A rationale: Oxytocin is the hormone responsible for the let-down reflex during breastfeeding. It is released from the posterior pituitary gland in response to the baby’s suckling. This hormone causes the milk ducts to contract and eject milk from the alveoli into the ducts, making it available for the baby.

Choice B rationale: Progesterone plays a role in preparing the breast tissue for lactation during pregnancy, but it does not directly trigger the let-down reflex.

Choice C rationale: Hindmilk is the milk produced later in a feeding session, which is richer in fat and calories. It is not a hormone and does not cause the let-down reflex.

Choice D rationale: Foremilk is the initial milk released during breastfeeding, which is higher in water content. It is also not a hormone and does not cause the let-down reflex.

Choice A rationale

Unstable vital signs in a newborn could be attributed to various causes such as infection, respiratory issues, or cardiovascular problems. It is not directly linked to the absence of phytonadione injection.

Choice B rationale

Low glucose levels in a newborn can result from conditions like prematurity, maternal diabetes, or feeding issues and are not a direct consequence of the absence of a phytonadione injection.

Choice C rationale

Acrocyanosis, a bluish discoloration of the hands and feet, is a common and benign finding in newborns due to immature blood circulation and is not related to the absence of phytonadione.

Choice D rationale

Phytonadione (vitamin K) is essential for blood clotting. Absence of this injection can lead to bleeding issues, such as oozing at circumcision sites, due to vitamin K deficiency bleeding (VKDB).