The Outer Limits - Season 3 Episode 6 Dark Rain

The value of the greatest of joys -- a healthy baby -- becomes evident after chemical warfare leaves humanity unable to produce normal offspring. Those rare couples like Sherry and Tim who do conceive a normal child become the focus of intense government attention as desperate officials seek a cure. Held captive in a secret maternity hospital run by Dr. Royce, Tim and Sherry realize the panic-stricken government plans to make their beautiful new-born daughter a permanent ward of the state.