I have MC Command Center and I've checked all the settings and see nothing to cause this... My female sim keeps having boy babies it's like her 5th boy baby in a row. I'm doing the 100 baby challe...
My sim with nine children has 4 boys and 5 girls, all mixed together. With her grandchildren, the first 8 had only one girl, so I was kind of concerned. Then the last six had only one boy. It will be interesting to see how the fourth generation turns out.