Seriously, everybody - his girlfriend isn't being just a little nervous. She is suffering from a serious postpartum anxiety disorder that often overlaps with postpartum depression. She needs medical treatment!!! Please stop minimizing it. Here's just an excerpt from an article on it:

"Everyone experiences anxiety differently.

But people with postpartum anxiety experience thoughts that are usually:

uncontrollable
racing
consuming
disrupting
overwhelming
recurrent
irrational (not logical or realistic)
frightening

These uncontrollable, consuming thoughts tend to center on a few major areas of worry, such as:

fears about the baby’s and one’s own health
fears about a parent or partner becoming ill or dying
a sense that something bad will happen
irrational obsessions or fears
blaming oneself excessively when something goes wrong or feeling excessively guilty

Postpartum anxiety can also cause physical symptoms, including:

unexplained exhaustion
trouble sleeping
trouble concentrating
increased irritability
muscle tension
feeling on-edge, restless, or wound-up
a rapid heartbeat
feeling panicky for no clear reason

Postpartum anxiety may make it harder for a person to bond with their baby. It may also negatively impact a baby’s mental and physical development. Left untreated, postpartum anxiety can also lead to serious negative consequences such as infant neglect and, in extreme cases, infant death. "