Felicia, I also use the boiling method, last when water is boiling, then add teats and turn off the gas. If not wrong, I rem in Mrs Wong classes 4 yrs ago, she mentioned this boiling method is recommended, but we have to always remember to off the stove when water is boiling, otherwise the bottles may be boiled down to plastic. When the water is boiling, let it boils for around 7mins before turning off the gas, this will thoroughly sterilize them. Not sure if she touch on this topic anymore.
Anyway, about shopping, last Thurs I overestimated myself. after visit to gynae, I went on shopping and makan spree till night. By less than half a day, I was already feeling tired and felt cramp on lower tummy area. Had to sit down frequently to rest. Not as strong as I was in first preg, thus, for you ladies who are going shopping, please get friends or partners to be with you.