I used Baby Plus (www.babyplus.com). It's a prenatal education system, can be use from Week 18 onwards.

My sister bought it in Singapore, apparently it's very popular there. Initially my DH and I are quite skeptical whether it really helps to develop baby to learn before they are being borned. Then we saw the positive results of BabyPlus used on 3 babies (my sisters and my cousin). They are calmer, alert, active and intelligent (in terms of learning curve). The oldest baby is 18 months. So, we use it for our newborn too.

We see positive results in our newborn and even the Nursery staff commented that he is more alert and calmer (less crying) than other newborns, especially when it comes to sleeping, feeding and bathing time.