Do I need to sterilize bottles and pacifiers after every single use?

For me, sterilizing is quite convenient for me since I am using a sterilizer. Thus, after every use I will sterilize them, even for my own breastpump parts. It is better to practice good hygiene while baby is young. When baby turns older (> 2 years old), I reduce the frequency of sterilizing e.g. once to twice per day only.