I have 2 week.I found some information about baby growth in 2 week like this.Pregnancy 2 weekend the development starts with the eggs getting fertilized by the help of the sperm. The exciting part takes place during fertilization .Come letâs share some more details about the process. Babyâs genetic or hereditary material is composed of 46 chromosomes. Now 1 chromosome each from the egg and the sperm decides the sex of the baby. An X chromosome is there in your egg. X or Y chromosome may be present in the sperm. During fertilization of your egg if X-chromosome exists in the sperm then a girl will bless you and if the chromosome is Y type then a boy child is your prize. Isnât it interesting?