Before you can make the headband you will need to know the appropriate size. This can be done by measuring the individual or by using generalized measurements based on age or weight. If measuring in person, you will want to measure the circumference of the head, in roughly the same place that you intend the headband to go. This will usually be just above the ears.  Methods. Babies are fragile and do not like to hold still, so taking their measurements can be challenging. If you have a cloth measuring tape, use this. Avoid metal measuring tapes as they are inaccurate and may scratch the baby. If a cloth measuring tape is unavailable, measure the head using a length of soft string and then comparing the string to another measurement tool. If the baby is not located nearby or if the baby has not yet been born, you may have to rely on generalized measurements. These can be found readily on the internet. Try searching for standard sizes on sewing and craft websites and message boards. It may also be possible to find another child of a similar size or age and measure their head. You will want to decide the appropriate width of the band. This will largely depend on the size of the baby who will wear the headband, as a too-wide band will not conform to the head and simply slip off. A newborn will likely not be able to wear a band much wider than half an inch. A six-month to one-year-old baby will probably be able to wear a one inch band. A toddler will probably be able to wear a two inch band. You may wish to test first before deciding. This can be done by cutting scrap fabric to try to visually guess the correct width or by having your baby try store-bought bands first to find the proper size. The materials for the band will largely depend on the type of band you wish to make. Since babies have soft, fragile skin, stretchy and soft materials are best. Stretch jersey, velvet, or lace are best suited to infant headbands. This material should form the band itself. More options are available for embellishments, as these...

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Write a summary of the previous text in Chinese:
测量头部。 决定尺寸。 选择材料。