Getting the right weight for your baby is as important as coloring and clothing them, and it is an area that is often overlooked by new artists. However, it can go a long way to making the end doll seem to much real when someone holds it. You will find that most reborn dolls cheap are filled with fiberfill, or fine sand as its very easy to get the correct weight with them.
Sand, while ideal for it, does come with its problems however. For example, the baby is usually filled with secured bags of sand to make sure it gets weight in the correct places and it doesn’t all end up in one area. However, If one of these bags splits it will make a large mess, and the baby will then be weighted incorrectly which defeats the initial purpose of it. It is nowadays more common to find polypellets or even glass beads as weights in reborns. These are easy to use, even more so than sand as you will not lose grains here and there, they will not leak out of tiny holes in the container and are also relatively cheap while not compromising on quality.
Baby fat pellets are also used, and can give a more realistic feel to the reborn if used correctly. It is important however that you are careful which body parts you use them in. It is not uncommon with some parts to react badly with some forms of silicon. Where possible, you should keep the pellets in fabric or nylon bags inside the body to stop this happening. This is also a good idea in case they need replacing as well.
Before calculating what weight you need to make your baby, you should know how old you are aiming the baby to be. You will need to choose how heavy to make the baby depending on this. For example, On average, babies gain about 1-2 pounds (1/2 to 1 kilogram) per month for the first six months, and an average of one pound (1/2 kilogram) per month from six months to one year. When deciding on the age of the baby add this to the babies starting weight. You can also find the average weight of babies for the first 36 months at various websites which are a good indicator too. It is even better of course if you have first hand experience from holding a baby.