Women with more severe cases of prolonged and continuous periods may want to consider pharmaceutical options. In cases of hormonal imbalance, most doctors prescribe oral contraception or any hormonal therapy to regulate the menstrual cycle and balance your hormone levels.
The bone that you sit on is also known as the sits bones. The  scientific name is the ischium which is a large swelling  posteriorly on the superior ramus of the ischium.
He is almost 4 months now and can sit without me holding him. My son just turned 4 months and he also loves to sit up, either in his bumbo, propped up by pillows or someone holding him in a sitting position. He loves to just sit and look around, he hates laying down now!!