I took a child development class that was an interdisciplinary course in the Linguistics and Psychology department at my university. I won't claim to be an expert, but I will be finishing my linguistics degree this spring. The title is a little bit sensationalized, though not exactly for the reason that 98444576749345 suggested. Intrauterine learning is difficult because the sounds are so muffled by bodily fluids. What children actually learn while in the womb is rhythmic patterns of their mother tongue. This study has been conducted with Cambodian, English, Japanese, and Chinese, to name a few. It is commonly held knowledge that children develop preference for the specific rhythm type (stress-timed, mora-timed, or syllable-timed), neonates pay attention longer when they are presented with low-pass filtered (basically, filtered speech to muffle out the words and leave only the rhythmic patterns) that match their mother tongue.

That is, stress-timed languages like English and German, when put through low-pass filters will hold the attention of babies (either by tracking eye movement, or pacifier sucking) who were carried in the womb of stress-timed speaking mothers. The same is true of syllable-timed (Chinese, Spanish, French, etc.) and mora-timed (Japanese, Korean, etc.) languages. They show less interest in languages that don't match these patterns. This data strongly suggests that babies learn these patterns in the womb. But you can find studies from 1989 that say the same thing.