I'm 37 weeks pregnant: is my baby fully developed?
No, your baby is not fully developed at 37 weeks.
The brain is one of the last things to develop and makes huge growth during the last weeks of pregnancy. In the attached photo from the March of Dimes you can see the difference in brain size from 35 weeks to 39 weeks.
Other internal organs are also rapidly developing during the last weeks of pregnancy. The brain, lungs and liver all have significant development after 35 weeks. The eyes and ears also develop late in pregnancy.
It is important to remember that your due date is just an estimate. You may not be as far along as you think. Giving your baby a full 40weeks to develop gives them the healthiest start to life.
If you baby is born at 37weeks they are considered premature but will most likely not have complications. A baby is not considered full term until they reach 39weeks.
The other thing to consider is how accurate gestational age is. First, most people don't know EXACTLY when the baby was conceived and implanted. So even though your LMP says your 37 weeks, you could be 38 weeks if you ovulated early in your cycle (I know I ovulate early). Second, babies don't know they're supposed to grow at a certain rate. While babies generally match the development that their gestational age says they should be, babies all grow at different rates just like kids do. A baby's gestational age could be 39 weeks, but physically they may only be 37 weeks developed. That's why some women deliver late. The baby is taking longer to get where they need to be.
I think that babies will come when they come. If they're a 1-2 weeks early or late I don't think it makes a huge difference.
Now she's a thriving, happy, little 7 month old who loves to "scream" about everything she finds exciting. lol :)