From helping them distinguish between vowel sounds, to helping them segment the speech stream so they can expand their lexicon, IDS only presents benefits to infants that will compound in the long term to make them successful in producing adult-like utterances.
There have been countless studies showing the importance of IDS in a baby's development and how it sets them up to be successful adult speakers. The baby on the left is being prepared for an EEG test to look at how her brain waves react to IDS (you can read up on a study like this on the Studies page). Also, it's shown that babies prefer IDS too!