No. Nor did Polanski have any intention of showing it. He never shot any scenes that would have given a view of the baby. Some viewers mistake the flashback to Satan’s eyes, after Rosemary views the baby in the cradle, as being the eyes of the baby, but they are not. Not showing the “monster” in a horror film is an old technique that creates a different type of suspense. That moment in the film where Rosemary 1st sees her child is supposed to be about her reaction, which is especially horrible for her considering all the suffering she’s been through during the pregnancy.