Hi ladies! My cousin's wife was round at mine the other week and was breastfeeding, and using nipple shields. She highly reccomended them and I didn't ask her at the time, but can you use this from day one? Like from the first time you breastfeed? Or do you have to introduce them later on? Just wondering, as I'm starting to pack my hospital bag and don't know whether to put them in or not! Any help would be great!!