Noni, in September ther can still be cold weather from time to time. The nights can still be cold too. So while I won't go all out buying thicker clothes, baby will need something warmer to wear kwim? Here in September last year, we had a really cold snap that had us in full winter gear for 2 weeks before it started warming up again. Erin was a mid october baby and she still wore some longer things at night, cause the early mornings can still be cool then too. And you will be surprised at how much stuff you will be given once baby arrives too - I didn't have to buy clothes for Erin until winter LMAO.