During the 15th C many babies and younger children wore similar unisex clothing.
For babies, a simple loose gown can be made, rather like a shift or long shirt. Modern underclothes and a nappy can be worn underneath, although we are lucky enough to have a supplier of environmentally friendly nappies within our household, which also can be made to look fairly authentic! This is an ideal garment; it is cheap and easy to make, easy to clean and comfortable for baby. Because a great deal of time is spent outdoors some form of head covering is highly recommended. This could be a small coif, hood or a simple knitted hat.
As a child grows they will need a set of adult style clothes. As there was no youth culture, the fashion at the time was to dress older children as "small adults", so most patterns just need to be scaled down to the appropriate size. Quite often children’s clothes can be made using off-cuts from your own sewing projects, or bought from some traders. Remember that it is perfectly allowable to make garments out of panels having contrasting colours!
Children need not cover their heads but it is advised in all weathers and is also authentic. A great deal of time is spent outside. Sunblock is also recommended, even on an overcast day.