Hindi · Pronunciation Guide
Not English "doe" — the d is dental, tongue on the teeth, and the o is a long pure vowel with no w-glide at the end.
do
A monosyllable built on a long vowel, so it is heavy and needs its full duration; there is no accent to place, but shortening it makes the numeral sound hurried and indistinct next to the equally short-looking numerals around it.
Listen: दो
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मेरे दो भाई हैं।
Mere do bhaaee haiṁ.
I have two brothers.
Listen: मेरे दो भाई हैं।
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"Mere do bhaaee haiṁ" agrees in the plural throughout — mere rather than meraa, haiṁ rather than hai — even though bhaaee itself does not change shape. And the verb is haiṁ with nasalization, which is the audible plural marker in this sentence.
English speakers reach for the alveolar d of "do" and then diphthongise the vowel, producing something that sounds to a Hindi listener like a retroflex-ish ड plus a glide. Both halves need fixing: teeth for the tongue, and a monophthong for the vowel.