Hey! From my experience, usually lang yung mother ang naka-primary sa Philhealth ng newborn, pero pwede pa ring magamit ng tatay if he's also a member, it's more about having two coverage sources kundi may emergency or kung malaki ang bill. Best approach is i-confirm directly sa Philhealth office or sa hospital kung saan magpapanganak ka, kasi bawat case minsan may slight differences depende sa setup ng contributions at beneficiary registration.
1 philhealth lang, and usually sa mother. nag ask din kami sa hospital about it.