No, two females alone can’t produce a baby today; with donor sperm, reciprocal IVF lets both have biological roles.

Yes, two women can have a baby together using donor-sperm IUI or IVF, and reciprocal IVF lets one provide eggs while the other carries.

Yes, two females can have a baby using donor sperm with IUI or IVF, including reciprocal IVF where one provides eggs and the other carries.

Yes, two type B parents can have a type O baby if both carry the hidden O allele and each passes it on.

No, two human eggs cannot make a baby; mammal embryos need sperm DNA plus parent-specific imprinting marks to develop.

Yes, two brown-eyed parents can have a blue-eyed baby when both carry variants that reduce iris melanin.

Yes, two blue-eyed parents can have a brown-eyed baby when certain gene combinations boost iris melanin.

Yes, A and O parents can have a baby; the child’s blood type will be A or O, not B or AB.

Yes, type A and type O parents can have a baby; the child’s ABO type will be A or O, not B or AB.

Yes, some 5-month-olds can start thin purées if clear feeding readiness is present; otherwise wait until about 6 months.