怀孕到现在已经是３３周３天，距离宝宝出生，时间越来越短，我的心情也越来越复杂。这几周每到周末，我就要出门给宝宝买东西，把她的小床给装好，床上用品 给买好，玩具都挂上。还总惦记着天好要把她的小衣服给整理出来洗干净分类放好。一天到晚忙里忙外，看这厨房不顺眼，要大扫除。看这前院不顺眼，让领导把花 全给换了。看这后院不顺眼，把菜地的荒菜给拔了，准备换上刚出苗整齐的蔬果，就等着宝宝夏天出生后可以吃上新鲜的瓜果了。

今天我和两个同事提到我这段时间的种种变化，他们都提到了nesting effect/instinct。我觉得很有趣，回来查了一下，觉得还是真是那么回事。看来人类发展那么多年，母性却始终和动物相通阿。

Nesting

Have you noticed that you have the urge to clean everything in sight lately? Are you rushing around your house, completing the ironing, reorganizing the cupboards, or color-coding your wardrobe? If so, then you might be experiencing what is commonly referred to as the nesting instinct. The nesting instinct is a frequent occurrence throughout pregnancy, and is often a sign that you are about to welcome your baby in to the world! But why do pregnant women experience this nesting instinct and is it safe and healthy for you and baby? Here are some of the basics about the nesting experience during pregnancy!

What is the Nesting Instinct?
The nesting instinct is the name given to the distinctive urge to clean, tidy, and organize that occurs during pregnancy. One of the many pregnancy symptoms that you will experience, the nesting instinct generally kicks in around the fifth month of pregnancy, however it can also occur much earlier or much later. Many women acutely experience the nesting instinct in the final days of their pregnancy, and this can often be a sign that labor and delivery is close at hand. Nesting tends to vary from woman to woman; in fact, some women don’t experience the nesting instinct at all when they are pregnant. Others experience mild forms of the instinct while others feel the urge much more severely.

What Causes the Nesting Instinct?
The nesting urge in pregnancy is thought to be caused by both biological and emotional factors.

Most females in the animal kingdom experience similar patterns of cleaning and preparation when they are pregnant. From birds to bears, female animals appear to have an intrinsic need to prepare ahead of time for their new arrival. It is believed that females are programmed to experience this nesting instinct in order to ensure that their offspring will be cared for properly after birth. By having your baby’s room ready, all her clothes organized, and her meals planned, you are ensuring that your baby will have the best chance for growth and survival after birth.

The nesting instinct probably also involves emotional components as well. Pregnancy is a time of intense hormonal fluctuations, and these changes can cause you to act in crazy ways! As your hormones settle down in the second trimester, you may feel increasingly energized and excited about your baby’s birth. This can incite many women to begin cleaning, organizing, and planning for their baby’s arrival. Furthermore, social expectations also play a role in the nesting instinct. Parents are often expected to do special things for their baby’s arrival, including decorating a nursery, cleaning house, and purchasing new clothes.

Not Just Pregnant Women
Pregnant women aren’t the only people who experience the nesting instinct. Men who are expecting a baby often feel the urge to clean and organize too! Many take a newfound interest in finding a new job, working on their car, or landscaping the garden.