Now that it's getting warmer where I live, I'm afraid of dressing my baby too warm or too cold. I know it's said to just have them in an extra layer from what i would wear, but if I'm wearing a tank top and shorts, what is the "extra layer" I put baby in? Short sleeves and pants? Or can baby wear what I would wear in the warmer weather? Is there a guideline somewhere that says "if it's 80 degrees, baby is comfortable safe is X amount of clothing"?