i used 0-6 month 2.5 tog bags for my girls (both May babies( through Perth winters and they were fine. You can layer a bit to get xtra warmth - long sleeve body suit under a long all in one etc.
DS was a summer baby so was mostly in a singlet and swaddled in muslin wraps when he was NB. We got him a grobag when winter hit (i think it was only a 1.5 tog as we have a wood fire so it was still quite warm in our house so this one suited the temp for us the best) which was great during winter. But it only lasted that one winter. When winter came around this year he hated it
I had grobags (and other sleeping bags) when we stopped swaddling DS. But I preferred the sleeping bags for the colder weather because they have arms. Never quite understood the winter bag without arms. But I definitely swear by sleeping bags, regardless of brand! We had a 6-18 month 1 tog, which was perfect through Jan/Feb in Melbourne. The temp thing and clothing guide were very helpful too. DS is now nearly 2 and still in the sleeping bags - he stands up in them, but only ever unzips a little bit.
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