Becoming a parent changes how you see everything, including science. As a physiology PhD trainee and former Navy hospital corpsman who practiced medicine in a mid-level role, I’ve spent years learning how the body works under pressure. I didn’t expect my most meaningful physiology lesson to happen in a delivery room.

My son had a rough start. He was born through meconium-stained fluid, which can sometimes make it harder for a newborn’s lungs to adjust to breathing air. Meconium aspiration, as it’s called, means a newborn baby breathes in a mixture of meconium (an infant’s first stool) and amniotic fluid. It can briefly affect how well oxygen moves from the lungs into the bloodstream. He needed extra breathing support and spent his first days in the neonatal intensive care unit (NICU).

Seeing your newborn surrounded by monitors is overwhelming for any parent. For me, the equipment wasn’t mysterious; I understood what it measured and why it mattered. That helped me explain what was happening to my partner and our family in calm, simple language. At the same time, knowing more also meant knowing the risks. I had to translate the science into reassurance and hope, protecting the people I love from unnecessary fear.

One challenge my son faced involved how blood flows through a newborn’s lungs right after birth. Before birth, the placenta provides oxygen. After delivery, blood vessels in the lungs must relax so oxygen can move easily into the blood. This transition doesn’t always happen instantly, but most babies adapt beautifully with gentle support. Watching that adjustment unfold in real time made physiology feel deeply personal.

As he stabilized, the lessons became quieter but just as meaningful. Nurses tracked how much he ate, how often he wet diapers, and how his weight changed. These simple signs showed that his body was maintaining balance, something scientists call homeostasis. When mild newborn jaundice appeared, light therapy helped my baby’s body clear the bilirubin naturally. Even his changing sleep patterns reflected how quickly his nervous system was organizing itself.

Now that we’re home, physiology shows up in the happiest ways. My son is no longer a quiet newborn. He’s an active toddler cruising along furniture, wobbling into new steps, laughing, falling and popping right back up without a care. I find myself thinking about balance and coordination as his nervous system learns how to control movement, about hydration when he’s running nonstop and refusing to slow down, and about temperature regulation when he comes in flushed and sweaty from play. Even bedtime feels different now—sleep isn’t just rest, it’s when his brain organizes new skills from the day. Vaccines no longer feel abstract, it’s like watching the immune system learn to protect him.

My training helped me stay grounded during a scary beginning but also reminded me that science isn’t just pathways and equations, it’s people, trust and care. Parenthood hasn’t pulled me away from physiology. It’s helped me see it everywhere.