Language development varies a lot and if there is no concern about his hearing, I will not be too concerned about his vocabulary at this age. The unsettlement that accompanied all the recent changes may easily cause all everything that you describe. It is important not to give attention to the temper tantrums, but to be firm and remain loving. There is no need to discipline him in any other way, because he is not naughty. The book Toddler Taming by dr. Christopher Greene may be of value.
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