It is normal to show your belly 2 months after you are pregnant with your second child. This question involves when the uterus can be seen to increase in size with the naked eye. Generally speaking, the uterus slowly enlarges in a process, and it is after 12 weeks that the uterus can be seen with the naked eye and the pregnancy becomes visible. If your belly is visible once you are 2 months pregnant, that is, around 8 weeks pregnant, it may be caused by the accumulation of fat in your belly due to more nutrition, not necessarily due to your uterus enlarging. If this happens, you can go for an ultrasound to see if the uterus has enlarged enough to show or not.