the interactions between parents and infants. Parents use CDS not only to promote language development but to foster a positive relationship with their infants. The younger the child, the more exaggerated the adult's CDS is. The attention of infants is held more readily by CDS over normal speech, as with adults. The more expressive CDS is, the more likely infants are to respond to this method of communication by adults. A key visual aspect of CDS is the movement of the lips. One characteristic is the wider opening of the mouth present in those using CDS versus adult-directed speech, particularly in vowels. Research suggests that with the larger opening of the lips during CDS, infants are better able to grasp the message being conveyed due to the heightened visual cues. Through this interaction, infants are able to determine who positive and encouraging caregivers will be in their development. When infants use CDS as a determinant of acceptable caregivers, their cognitive development seems to thrive because they are being encouraged by adults who are invested in the development of the given infants. Because the process is interactive, caregivers are able to make significant progress through the use of CDS. Purpose and implications Use with infants Studies have shown that from birth, infants prefer to listen to CDS, which is more effective than regular speech in getting and holding an infant's attention. Some researchers believe that CDS is an important part of the emotional bonding process between the parents and their child, and helps the infants learn the language. Researchers at Carnegie Mellon University and the University of Wisconsin found that using basic “baby talk” may support babies in picking up words faster. Infants pay more attention when parents use CDS, which has a slower and more repetitive tone than used in regular conversation. CDS has been observed in languages other than English. Purposes and benefits of CDS include support the ability of infants to bond with their caregivers. Children learn fastest who receive the most acknowledgement and encouragement of what they say, who are given time and attention to speak and share, and who are questioned. Infants are able to apply this to larger words and sentences as they learn to process language. CDS aids infants in bonding to caregivers. Although infants have a range of social cues available to them regarding who will provide adequate care, CDS serves as an