Wonder Week 5:
The World of Changing Sensations

For much of the last 4 or 5 weeks, you have watched your infant grow rapidly. You have become acquainted with each other, and you have learned all of his little ways. His world at this time is hard for adults to imagine. It's in soft focus and its qualities are undefined—in some ways it has not been so different from his life in your womb.

Now, before the mists that envelop this infant world part and allow him to start making sense of all the impressions that he has been busy absorbing in the last few weeks, he will need to go through his first major developmental leap. At about 5 weeks, and sometimes as early as 4, your baby will begin to take the first leap forward in his development.

New sensations bombard your baby inside and out, and he is usually bewildered by them. Some of these new things have to do with the development of his internal organs and his metabolism. Others are a result of his increased alertness—his senses are more sensitive than they were immediately after birth. So it is not so much the sensations themselves that are changing, but rather the baby's perceptions of them.