It is known that Omega-3 fatty acids are good for a developing baby. But what is not known is that there are other alternatives available besides fish.
If you eat fish, please do a Google search for fish high in mercury or visit http://www.heart.org/HEARTORG/General/Fish-and-Omega-3-Fatty-Acids_UCM_303248_Article.jsp. Unfortunately, not all seafood are created equal, therefore, know before you eat.
I eat brown or golden flax seed (depending on availability) and Jamieson Omega-3 Select fish pills daily. They are both cheap and better than having no fish at all. I pay about $3 for a 500 gram bag of flax seed and $15 for a bottle of 150 Omega-3 fish pills. I also use a coffee bean grinder to grind one tablespoon of flax seed daily.
The brown and/or golden flax seed can usually be found in the baking aisle and/or the bulk foods section of any grocery store. I do not recommend getting the flax seed oil since it tastes like medicine. Furthermore, the already ground flax seed is usually very expensive. You can also get them in various other forms in any grocery store, but I like the idea of grinding it myself. Furthermore, I drink the flax seed in a half cup of water with two gulps.
My children eat a fish pill daily. I will have to start looking for fish pills for kids. My youngest finds the fish pill to large to swallow, therefore she drinks ground flax seed with milk. They are both tasteless to my kids, so they don’t mind.
To read more about Omega-3 DHA and EPA in its various forms, you can read it at http://www.cbc.ca/health/story/2007/10/15/omegathree-foods.html
To read about the benefit of eating Omega-3 fatty acids during pregnancy, you can read it at http://www.health24.com/dietnfood/Eating_throughout_life/15-50-652,21060.asp
I no longer eat tuna. Although it contains Omega-3 fatty acids, the amount of Mercury in the tuna maybe the reason I got occasional headaches in the past. You can read about it at http://www.cbc.ca/health/story/2007/03/02/tuna-labels.html