I may sound ignorant.... but was wondering is it a must to sterilize baby's feeding bottles?

During the first year of your baby’s life, he’s at his most vulnerable to illnesses. If bottles aren't sterilised, viruses, bacteria, and parasites can gather and make your baby ill. Your baby could develop anything from mild thrush to a more serious bout of vomiting and diarrhoea. It's not possible or practical to create a totally germ-free environment for your baby. But by sterilising your baby’s feeding equipment, you can help to keep him healthy.