As Professor Melissa Koenig discussed the language development of infants and children is astonishing, due to the abilities that they possess without any preexisting knowledge or experience of how language works at a very young age. If when we were young had those same abilities to recognize and detect all speech sounds, would we have chosen to learn a second language or third language than? My response to that would be of course, I would have wanted to learn another language than my native language than, because I already had the tools to detect speech sounds from every language. If I have the tools that adults didn't with language when I was an infant, I would have wanted to capitalize on that, since I now know how hard it is to detect language sounds from a language different than my own as an adult. Although this is very unlikely for infants to learn a second or third language for besides there native language due to their environment they are exposed to. I believe that it mainly depends on what their parents or caretakers expose them to while they are infants. Infants could easily learn the basics to multiple languages if they are exposed to learning situations that keep on repeating the words and meanings from a different language or two. Than the words would need to be maintained by continuous use by both parent and infant, in an infant directed social interaction. I only think that this is possible if the parents begin the process of teaching their infant languages at 4 to 6 months of age, even if they cannot talk yet because eventually they will imitate or mimic and we know by 12 months of age they start to lose touch with language sounds that they do not hear from their parents or the outside environment. If you were to have kids would you start to incorporate another language than yours, into your infants language capabilities before they were gone?
In response to your question, yes, I would incorporate more than one language into my child's language capabilities if I were to have children. This I say because I am already bilingual, thus, it would be much easier for me to talk to them in both languages. For a person who knows fluently only one language, I'm sure they would definitely choose to incorporate more than one language into their child's language capabilities, but it might be very difficult for them to do so.