Are "square" breasts normal after reduction or do they go back to normal shape?

Thank you for your question.You are very early in the healing process, so the shape of your breasts will continue to change as you heal.  If the breasts have a square shape to them, I would recommend changing the bra you are wearing.  You should be wearing a bra that has cups not underwire.  This will help give the breasts a more natural shape as you heal and I would stay away from sports bras.  They tend to make the flat and square looking as you are healing.

Yes, the anchor pattern breast reduction often gives an early "square' appearance then improves with time. In my experience, the lollipop reduction technique not only has far less scars but also a better shape to start. In time your result should improve significantly. 

What you describe is typical for a inferior based or "T" pattern breast reduction. The distance from the nipple to the breast fold is kept shorter as a rule because over the next months the distance will stretch two centimeters or more and the breast shape will round out. Things should work out. Nipple inversion also is not uncommon, and even more so with a vertical reduction pattern, and this too will resolve for most.