Researchers at the Australian National University (ANU) reviewed 43 separate studies and found anxiety before and after a child arrives is just as prevalent as depression, affecting around one in ten men, around half the rate for women.
"Men can feel left out of the process, because pregnancy and childbirth are so integrally linked to the mother. It can compound the problem. They don't seek help, because they think 'it's not so much about me'," said Liana Leach from the ANU Centre for Ageing, Health and Wellbeing.
"Having a new baby is a time of great adjustment for many parents, and it is normal to be nervous, but anxiety can become a problem when it persists for extended periods and interferes with every day functioning," Leach added.
Symptoms of anxiety can include worrying or feeling keyed up much of the time, feeling irritable, and fears for the baby's safety.
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Physical symptoms can include a racing heart, feeling sweaty, poor sleep and poor appetite, researchers said.
Risk factors include lack of social support, especially from a partner, financial difficulties and a history of mental health problems.
The study was published in the Journal of Affective Disorders.