Sergey
Babies can't say "th".
Did you notice that native English speakers' babies can't say "th"? They can't make "th". Is it necessary to work with them so they can coordinate putting the tongue tip through the teeth? I know this is huge challenge for non-native students however I didn't know that is a problem even for native speakers.
May 22, 2019 11:46 PM
Comments · 7
'V' is another tough sound to learn for young children. I know because I've been called "Wince" and "Bince" a lot :)
May 23, 2019

Normally, children learn the sounds on their own.  The R, W, and TH sounds come last at about age 5.


More information here:

https://childdevelopment.com.au/resources/child-development-charts/speech-sounds-developmental-chart/


[excerpt]

5-6 years  -  Speech should be mostly clear and easy to understand, but some immaturities may still be noted (e.g. with 'r' and 'th' sounds)

May 23, 2019
Yes, some sounds are harder than others and take longer for babies to learn. (I imagine the R is difficult for Russian children.) Regionally, many adult native English speakers do not pronounce a standard TH; substituting a stop (like T, D — traditional US East Coast accents, Ireland) or a labial (like F, V — popular in Estuary English).  In America, if a school child pronounces TH as F/V, then a good school may send the child to a remedial pronunciation class.

I’d recommend that the learner stick to the standard variant. Not only does that sound “proper” (nonstandard is associated with low social class), but it will allow the learner to adapt to nonstandard variations if necessary. Starting with a nonstandard pronunciation would be a problem, as the learner wouldn’t have a concept of the TH as a separate phoneme (or phonemes, counting the voiced and unvoiced TH).

May 23, 2019
Yes it is necessary for native English babies to learn the TH sound. As a native English speaker myself I know that there are plenty of words that have the TH sound in them. 
May 23, 2019
I know a boy who has been speaking English for over two years now, and he still doesn't have this sound.
May 23, 2019
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Sergey
Language Skills
English, Russian
Learning Language
English