
Babies look so sweet in caps, and once upon a time they wore them from the time they were born. They wore a lot of things actually, as Thomas Jarrold wrote in this 1736 excerpt:

Formerly, the dress of an infant was cumbersome and oppressive, it is now much simplified, but still it admits of improvement; many parts are unnecessary, and even injurious, and require an experienced person to adjust them, and, in dressing the infant, so much time is consumed and so much toil occasioned as must greatly exhaust and weary it; to this it ought not to be subjected, that cannot be proper which distresses the child …. its dress should be light and warm, and so constructed, that the time occupied in dressing may not be greater than the capacity of the child to bear it.
Indeed! The Foundling Museum’s record books also list a great variety of garments, and those for the head include cap, bonnet, biggin, forehead-cloth, and head-cloth – not necessarily worn simultaneously. I’m particularly fond of these little caps because they show such exquisite stitching. I don’t think anyone today does plain sewing so fine and dainty.

This elegant example is made of linen, and it measures about 10 inches across the double brim. From the front to the back hem is about 8 inches. The lace insertion is on the upper brim only. (If you can identify the lace, please let me know!)
The embroidery worked along the edge of the insertion and where the crown is gathered to the brim is typical of 18th century whitework on infant clothing.

One puzzling feature is the running thread along the hem of the brim. On the under layer, it terminates a couple of inches short of the center on each side. It appears to function as the familiar “stay stitching” of today. However, on the upper layer, it continues from both sides, meeting in the middle. And the threads are left hanging!
The back is finished simply, with two tiny cords to draw for a closer fit. There are no ties (or pin marks) on the cap, another feature that was common into the early 19th century. Does that suggest that another head covering was worn with it? I don’t know of a baby today who could keep such a hat in place. And “that cannot be proper which distresses the child!”
