Hi! Congratulations on your pregnancy. How far along are you? So, first part of your question would all indicate normal. Maturity grading usually correlates with how far along you are. Grade 1 maturity usually means that you are 18 to 29 weeks along. Are you in that range? Anterior placenta just indicates where your baby imbedded in your womb which was on the side that is toward the front. This is not abnormal or a problem and half of new moms have babies with an anterior position. Single intrauterine pregnancy? Guess what? That's doctor code for normal healthy pregnancy with one growing fetus! Breech means as you probably suspect, that baby is currently feet first which is not a problem in the second trimester.
So overall, sounds like a good report from your doctor and all is well! Yay!!