At the end I got the information: it is also possible to breastfeeding at home.
The law doesn’t regulate when the breastfeeding should happen. For this reason it is possible to choose the time that fit best with your need. (after that you spoke with your employer.
If you work more than 8h/day, you have right or 2 times 45 min or one times 90 min.
So it is possible to start to work 45 min later and finish 45 min before; or finish to work 90 min before.
In this time is possible to go at home and breastfeeding.
All the information concerning this post were provided by the office of employment protection of Franken. (Sozialer Arbeitsschutz)