Theoretically speaking, pickled eggs can be eaten by children, but they contain high levels of lead, so they are not recommended for children.
The skin eggs are generally made from duck eggs, which are cured and processed into food products by utilizing the property of protein gelation in alkaline solution to turn them into elastic solids, and are named after the unique fungus group that forms a pattern similar to the pine pattern on the internal surface during the curing process.
The traditional process of making eggs contains high levels of lead, if consumed in large quantities, may lead to excessive intake of lead within a short period of time causing high lead anemia manifested in: hyperactivity, poor temperament, poor concentration, and even cause the loss of calcium in the body, resulting in poor bone development.
Therefore, it is not recommended for children to eat pickled foods such as eggs. You can give your child vegetables and fruits as well as high quality proteins to ensure balanced nutrition and promote their physical development.