L'ovedbaby organic baby clothing is quite true to weight, and is designed to be form-fitting and tailored to the body. Since cotton shrinks after the first machine wash/dry, to account for this shrinkage, the clothes are slightly longer than intended, so that they shrink down to the correct size. This applies to the kids clothing as well. As such, it's not recommend sizing up unless babies/kids is extremely tall/large for his or her size. If you find that you like the length of the garment prior to washing it, it's recommended to line drying to retain that length. Otherwise, feel free to pop it in the dryer to shrink it down slightly to its intended fit.
Newborn versus 0-3m:
L'ovedbaby newborn/preemie size is intended for 4 to 7 pound babies, and fits quite accurately. The zero to three months size is intended for 7-12 lbs. and while definitely fit longer and be a little bit roomier than NB sizes, still offers a nice tailored fit in the torso and arms.
That said, clothing is cut a little long to account for the shrinkage that will occur after first machine wash and dry since our garments are made with organic cotton with no synthetic blends. If you are looking for a form-fitting coming home outfit or a newborn photos outfit, we recommend the newborn size, with the understanding that you might need to line dry it if you feel that it is going to be too small for your baby once machine washed/dried. Otherwise, if you have other children who were born bigger than 7 pounds, we would recommend going with size zero to three months, as it will last longer than the newborn size.
The toddler and kids' sizes fit very true-to-age and are cut generously long. We do not recommend sizing up unless your little one is extremely tall or big for his or her age. Some shrinkage (in length only) will occur in the dryer, but again we already account for this by cutting extra long.