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 Credit: CC0 Public Domain A combined team of researchers from the University of Lyon/Saint-Etienne in France and the University of Sussex in the U.K. has found that the pitch of a baby's cries can be an indicator of voice pitch at age five. In their paper published in the journal Biology Letters, the group outlines their study and what they found. 
 
 The pitch of a person's voice is one of the characteristics by which humans are judged by others. For example, those with a high pitch are often found to be annoying, while those with a low pitch are seen to be commanding. Also, scientists have discovered in recent years that what happens in the womb can have a major impact on personal and physical traits—one of which is voice pitch. In this new effort, the researchers wondered if there might be a connection between the pitch of a baby's cries, and the voice they come into as children. To find out, they pulled voice recordings made during a prior longitudinal study of babies crying and compared them with the same individuals five years later. 
 
 The researchers found that the voice pitch of a crying baby could be correlated to speaking pitch five years later. Or put another way, the pitch of a crying baby could be used to predict what that child would sound like as a five-year-old. This finding led them to revisit the findings of another team who had found that right-hand finger ratios could be used to predict pitch in both children and babies. That team had found that if the index finger on the right hand is longer than the ring finger, a baby will likely to grow up to have a high-pitched voice. Conversely, if it is shorter, they will be more likely to have a lower-pitch voice. The researchers note that prior studies suggested this was due to hormone levels present in the womb. And this, they suggest, indicates that such levels are likely the cause of the impact on voice pitch. 
 
 The researchers also note that more work will need to be done to better understand the connection between the cries of a baby and how they will sound as children, because they only had 15 volunteer samples in their study. 
 
 Explore further: Pregnancy temporarily lowers a woman's voice – new study 
 
 More information: Florence Levrero et al. The pitch of babies' cries predicts their voice pitch at age 5, Biology Letters (2018). DOI: 10.1098/rsbl.2018.0065 
 
 Abstract 
 
 Voice pitch (fundamental frequency, F0) is a key dimension of our voice that varies between sexes after puberty, and also among individuals of the same sex both before and after puberty. While a recent longitudinal study indicates that inter-individual differences in voice pitch remain stable in men during adulthood and may even be determined before puberty (Fouquet et al. 2016 R. Soc. open sci. 3, 160395. (DOI: 10.1098/rsos.160395)), whether these differences emerge in infancy remains unknown. Here, using a longitudinal study design, we investigate the hypothesis that inter-individual differences in F0 are already present in the cries of pre-verbal babies. While based on a small sample (n = 15), our results indicate that the F0 of babies' cries at 4 months of age may predict the F0 of their speech utterances at 5 years of age, explaining 41% of the inter-individual variance in voice pitch at that age in our sample. We also found that the right-hand ratio of the length of their index to ring finger (2D : 4D digit ratio), which has been proposed to constitute an index of prenatal testosterone exposure, was positively correlated with F0 at both 4 months and 5 years of age. These findings suggest that a substantial proportion of between-individual differences in voice pitch, which convey important biosocial information about speakers, may partly originate in utero and thus already be present soon after birth. 
 
 

 The next time you hear a baby cry, take a good listen. It might tell you something about how its voice will sound decades later as an adult. 
 
 Research has already shown that the pitch of a person’s voice stays basically the same during adulthood and that how we sound as adults may be determined before puberty. A recent study indicated that the pitch of a boy’s voice at age 7 can mostly predict what he will sound like as an adult. 
 
 So when do our voices start emerging? One group of researchers hypothesized that differences in pitch would emerge very early — even in babies who haven’t yet learned how to speak. 
 
 Now, their new research — published last week in the journal Biology Letters — indicates that the pitch of babies’ cries at 4 months old may predict the pitch of their speech at age 5. In fact, the researchers said, the differences identifiable in babies’ whines can explain 41 percent of the differences in voice pitch that appear by age 5.
– Whether you have a high-pitched voice or a lower one, a new study suggests that it was probably evident when you were just a baby. As previous research has suggested voice pitch is unchanging in adulthood and nearly set in stone by age 7, researchers in France and the UK set out to explore just how early the pitch of one's speech might be determined, per a release. Their study, published in the journal Biology Letters, reveals the pitch of babies' cries is "a significant and substantial predictor of the pitch of their speech" at age 5, per the New York Times. Given that research suggests a high-pitched voice is tied to less testosterone exposure in the womb, and vice versa, researchers say it's possible that "a substantial proportion" of differences in voice pitch are determined in utero. "In utero, you have a lot of different things that can alter and impact your life—not only as a baby, but also at an adult stage," says researcher Nicolas Mathevon, who compared the "mild discomfort cries" of 4- and 5-year-olds (six French girls and nine French boys) with the same children's cries as infants. The results leads Discover to predict a future reality show following "celebrity judges as they scour maternity wards … for the iconic voice of a new generation." But though the study is "intriguing" based on its suggestion "that individual differences in voice pitch may have their origins very, very early in development," Carolyn Hodges of Boston University notes the small sample size raises the risk "that it is not representative of the population as a whole." (Women may hear their voice drop after pregnancy.)