I had 4 for DS who was also born in the summer. I washed every day so that was enough for me. I would suggest between 4 and 6 depending on how often you plan to wash. Also shop around for the large ones as the small ones only last about 4 weeks before they start getting to big.
There are some sized 70 cm x 70 cm. Avoid them, they are too small to be any good in my opinion. You want at least 100 cm x 100 cm, and I liked the stretch ones better. We only had 3 and had to go out when she was a week old to get another 3.
we live in a very dry hot heat especially in summer, Jack was born in late sept I had about 8 muslin, 4 light weight flanny wraps and a few heavier ones, cause feeding at 2am even when its 20+c outside it can get quite cool just sitting there, also I used my muslins as covers over pram as well
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