Hi, My DD is 4 and 1/2 months old and is bottle...

Hi, My DD is 4 and 1/2 months old and is bottle fed. I have always steralised her bottle since she was weaned at 3 months. One of my friends whose DD is 3 weeks older than mine was told by her CHN not to steralise bottles and just to wash them in hot soapy water. Has anyone else been told this? What are your opinions about steralising?? Thanks