They don't consume food while in the uterus... The food you eat gets absorbed into your body and goes through the placenta to the umbilical cord and in the babies blood stream the whole time during pregnancy
The baby takes the calories and nutrients it need from you from the start
What I'm asking is that when does the baby start to consume whatever i eat like how many weeks
You don't need to eat for two. You only need 300 more calories a day.