I'm expecting with twins they might be born small, so I have a small amount of tiny baby just in case, then I have got some first size and newborn and 0-3, is there any point in getting 3-6 yet or wait until they need it?xx
I would get some 3-6 hun cause it's like it happens over night suddenly you out it on and it doesnt fit. I bout up to 3-6 xxx my LO in neally 4 month and still in 0-3. But it does happen suddenly. Or just get 3-6 when they go up to 0-3 xxxx
My girls were 5.6 and 6lb and tiny baby fit them for ages, i bought tiny baby then they went into 0-3, but like @kedwards85 said I'd look at the weight rather than the size xx