Bill Guest was about 30 when his biological clock kicked in.

His friends were having kids left and right, and suddenly being a doting uncle wasn’t enough. Guest wasn’t particularly interested in getting married, but he did very much want a child, and not an older child.

“I wanted a baby,” said Guest, 40, of Villa Park. “I wanted to experience all of the stages of life.”

He is one of the small but growing number of single men who are becoming fathers via surrogacy, in which a woman agrees to carry someone else’s baby. Surrogacy can cost more than $100,000 and involves finding a woman who wants to carry your child, achieving a pregnancy via in vitro fertilization, and navigating the emotional experience of pregnancy and childbirth with a surrogate who has her own needs, responsibilities and boundaries.

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