This book is a significantly dense read, measured as new-information-for-Swathi per word-read. Due to this, the book has lent some difficulty to my memory, while simultaneously serving as one of the most fascinating reads from this year. To do justice to this work, I’m planning to write a review per chapter of the book, focused on the things I learnt from it.
Chapter 1: Milk:
I feel silly for not having known any of these before I read this chapter, but as a pampered youngest child, I never grew up around infants/babies in a manner to see these in reality. You’d probably have heard some of this at home growing up if you have a younger sibling. Perhaps. Or maybe you grew up with more superstitions and you’re not sure of what’s based on science – so this list could help!
Feeding Basics:
- Apparently, human babies aren’t given water until they’re 6 months old! If they’re thirsty, they should be given more milk or formula.
Non-Human Mammals are also Weird:
- Platypuses don’t have nipples: newborns lick milk from milk patches on the mother’s stomach.
- When today’s leather-egged (typically reptilian) offspring are ready to hatch, they lick up the egg-coating goo. It’s usually their first meal.
- Totally unrelated, but I finally learnt what century eggs in Asian restaurants are! They’re eggs preserved in an alkaline medium like clay, which causes the yolks to blacken and the whites to brown. It also adds a sulphuric flavor from the ammonia in eggs. The Chinese name translates to something like “leathery eggs,” and that tenuous connection made it feel acceptable to shove this fact in here.
Colostrum:
- Humans didn’t believe in the importance of breast milk, and believed colostrum to be rotten milk. In the 15th century, a German author Bartholomaus Metlinger wrote:
- “The first 14 days it is better that another woman suckle the child, as the milk of the mother of the child is not as healthy, and during this time the mother should have her breast suckled by a young wolf.”
- Colostrum is dense with immunoglobulins: antibodies designed to respond to pathogens that the mother’s body identifies as dangerous. Before the discovery of penicillin, cow colostrum was used as an antibiotic. To date it’s believed to be effective for some conditions in humans.
- Meconium, a baby’s first poop, is alarmingly green, tarry, and thick. It’s mostly broken-down blood and protein that the fetus ingested before delivery, and it’s important that it’s discharged soon after birth. Colostrum acts as a laxative, helping wipe the baby’s stomach clean. This is why newborn babies typically lose weight after birth, until the colostrum switches to milk and the baby can start digesting food and fats.
Biotics:
- Breast milk is mostly water: it also contains proteins, enzymes, lipids, sugars, bacteria, hormones, maternal immune cells, minerals, and oligosaccharides. These stand out since they’re not even digested by the baby’s body – they’re prebiotics that ensure the growth of friendly bacteria in the baby’s gut! The prebiotics help promote good bacteria and annihilate harmful ones.
- Probiotics = ingesting bacteria that the human body should already contain. Prebiotics help these bacteria thrive.
- Apparently, synbiotics are a combination of prebiotics and probiotics, and postbiotics are what the probiotics create when given prebiotics…now that seems like crazy-town.
- C. difficile infections, which threaten the lives of patients who have been subjected to heavy doses of antibiotics, occur due to the annihilation of good bacteria from the patient’s digestive system. Recently, they’ve found a reliable treatment for it: pumping a brown slurry of a healthy person’s poop into the patient’s intestines. Fecal Matter Transplant is being studied in the US.
Mechanical Engineering of the Nipple:
- Montgomery glands are responsible for creating a lubricant over the nipples to prevent chafing from a baby feeding.
- The nipple is packed with nerves to detect a vacuum being created by the baby’s mouth and sucking, which starts the chain reaction of oxytocin being released. This is why we can use a breast pump to simulate the same reactions.
- Baby’s saliva creates a feedback loop for the brain: it’s a two way communication. The saliva is used to understand what the baby’s body needs, and the brain creates the appropriate mix of proteins and hormones in the mother’s milk to feed it. This is not replaceable by a breast pump.
- Human bodies are more expressive on the left side than the right, and 60-90% of women preferentially feed their babies on their left side. This is mind-boggling to me.
Cautionary Statistic:
- Breast cancer is the second leading cause of death in women, after cardiovascular diseases. We’ve become better at managing the impact of breast cancer by learning to diagnose it sooner, and testing more frequently. The incidence rate of breast cancer in humans has not changed, and is around 1 in 8 American women over their lifetime.












