I'm sorry, but this article is screwy in so many ways.
Babies are meant to feed frequently. As another poster said, this article also doesn't distinguish between human milk and artifical milk fed babies. Breastmilk is digested in 1 1/2 hours, for a full feed. A "snack" feed would digest sooner. Some babies are natual snackers. Or call them, nip and nappers.
The article does say this is babies in industrialized countries. African babies, on the other hand, are traditionally breastfed 3 times an hour, during the day, and of course, sleep in their mother's arms at night and this is not seen as a problem in their culture, but normal, and the babies thrive on this kind of treatment.
Frequent feeding at the breast, and co-sleeping and the attendant night feeds, prevent SIDS. The authors of this article/study are probbly not aware of this. Dr Sears is, and has written a book about it.
I could go on, but want to say, just ignore this kind of "study," and read your Womanly Art of Breastfeeding, and other books available at your LLL mtgs.