I sometimes have to preach at a baptism. Here’s an idea from a sermon by Maximus of Turin on the baptism of Jesus that I’m going to use someday.

He says we celebrate the birth of Jesus and his baptism  together in the liturgy because, though separated by years, his  baptism is another birthday.

“Then he was born from a virgin; at his baptism he is born in mystery. When he was born, his mother Mary held him close to her heart; when he is born in  mystery, God the Father  embraces him with his voice and says: ‘This is my beloved Son in whom I am well pleased; listen to him.’

The mother caresses the tender baby on her lap; the Father serves his Son by loving testimony. His mother holds the child for the Magi to adore; the Father reveals that his Son is to be worshiped by all the nations.”

Baptism is another birthday. We celebrate birthdays yearly. Some celebrate a child’s baptismal day along with his birthday every year. The baptismal candle and robe instead of a birthday cake.

Might be a good custom to recommend