Having a large baby could indicate that you may be diagnosed with gestational diabetes in future pregnancies.  You will need to do a fasting glucose to monitor for this if you get pregnant again.  You are at risk for getting diabetes later in life, especially if you are diagnosed with gestational diabetes.  It does not matter how old you were when you gave birth.  I had a 6 lb. 8 oz. baby 5 weeks early when I was 24.  That baby would have been over 9 pounds.  My second was born 9 lbs. 12 oz.  Then, my third was 11 lbs. 3 oz.  I did not get diagnosed with GD until my fourth child and have followed a diabetic diet since week 17.  I am now almost 36 weeks along and it looks like my baby is going to be big despite all my precautions, including taking insulin every night.