A baptism bonnet usually has one bonnet string that runs from one edge of the bonnet to the other. This keeps the bonnet from falling completely off if it becomes untied. It also helps preserve the ribbon because ends cannot fray. This is important for an heirloom garment that is handed down to future generations. It is simple to tie the single bonnet string once you know how.
Put the bonnet on the baby with the ribbon hanging down in front.
Grasp the the right side of the ribbon in your right hand 4 inches below the lower side of the bonnet. This is your right side, not the baby's right. Reverse these instructions if you are left handed.
Pull the ribbon to the left up under the baby's chin and make a 1-inch loop by folding the ribbon back to the right. Hold the loop in your right hand with your thumb in front. This loop of ribbon will point to the left.
Grasp the portion of the ribbon that connects to the other side of the bonnet with your left hand, 4 inches below the edge of the bonnet. Wrap the ribbon up over your thumb, bring it all the way behind the loop to the front. This is just like tying your shoelaces.
Push the ribbon behind the band over your thumb. Let go of the loop of ribbon in your right hand and grasp the ribbon you just pushed behind the band pulling out another loop of ribbon which points to the right.
Grasp the first loop, the one on the left, with your left hand and pull both loops out to the sides to tighten the bow.