Learn Turkish: Doktor bebeğin boyunu ölçmek istiyor. - The doctor wants to measure the baby's height.

This happens because of consonant mutation. When we add a suffix starting with a vowel to bebek, the hard k softens to a ğ. Here, we are adding the genitive suffix -in to mean 'the baby's'.

What are the two -u suffixes at the end of boyunu?

The root word is boy (height). The first -u is the possessive suffix connecting it to bebeğin to form 'the baby's height'. The final -u is the accusative case marker, used because this phrase is the specific direct object being measured. The -n- in the middle is a buffer letter separating the two vowels.

Why do we use the full infinitive ölçmek?

In Turkish, to say you 'want to do' an action, you use the dictionary (infinitive) form of the verb right before your conjugated form of istemek (to want). Since the main conjugated verb goes at the end of the sentence, ölçmek comes just before istiyor.