The United States is much different from many other countries. Many employment and labor issues are left to states and employers to decide. The federal government does not overreach.
You can see this play out with maternity leave laws in the U.S. There are a few federal laws that apply across all fifty states, but each regulation has qualifying criteria, leaving many holes.
State-based resources display the most comprehensive array of outcomes during pregnancy. Pregnant women often need to stop working because of complications. Of course, she also needs time to recover from childbirth, and income benefits are spotty at best.
Things even out a bit when you consider programs to help with the extra medical expenses. While pregnant, women have an additional need for prenatal care and delivery in the hospital.
Single parents often struggle with half the income, and double the expenses and responsibility. Making ends meet is an ongoing challenge under the circumstances.
Many state programs provide financial assistance for these families. However, the aid does not always come with clear labels and directions for use. Find some help here.