I asked similar before ds was born, but I still don't get it! I have a drawer rammed full of newborn and 0-3 months bodysuits- short sleeves with poppers between the legs. All were gifts- they all have lovely patterns or writing on them.
However, everything I've read says that these are to be used as a layer under sleepsuits. DS is 4 weeks now and I've not used any of the bodysuits: I just dress him in a plain white supermarket multipack vest/ bodysuit (the type that button under nappy) and a sleep suit. If it's cool when we're out, I use a blanket in the pram too.
It's July and temperatures here haven't got above 21 degrees so it's never been 'hot' for him to be in short sleeves and I can't see it being hot enough for the whole of the summer.
So do I just use these bodysuits under his sleep suit and no one ever sees them other than me when I change him? If so, what's the point of them being so heavily patterned?