lyre tail mollies

Do any body know if lyretailswill eat their young, I bought a pair a
month or so ago and noticed a baby swimming in the tank yesterday, But
today i can't find it anywhere, it's only a 6 gallon tank. Is there a
chance that "dad" got a free meal. I put a sponge over the inlet tube
of the filter as soon as I saw the baby , so it wouldn't be sucked up
into the filter ? Any advice is greatly appreciated.