Something known as "the dolphin effect" has brought pregnant women to spend time with dolphins. It is said that dolphin's high-frequency sounds are supposed to stimulate their baby's brain and develop its neuron abilities (while still inside the womb.)
If you don't have a year long pass to the aquarium, perhaps you might want to consider a more practical approach to baby brain development- fish oils!
60% of human brains are comprised of fat, and half of that fat is DHA omega 3. Fish oil supplements are loaded with Omega 3's that will help your "pregnancy brain" as well as help you form a smart and healthy child. You should be taking supplements before pregnancy, during pregnancy and after pregnancy. If you have any more questions or concerns I welcome your contact!
Buying Suggestions: Be careful to buy a supplement that is made from smaller size fish such as anchovies (because they carry less toxins,) and has been distilled (to remove the remaining toxins,) is made from ocean fish, not farmed fish (because farmed fish are often fed a grain diet which makes the fish high in Omega 6, not 3,) and lastly look for a supplement that does not have fillers (such as soybeen oil) and has a high mg count per pill.