Learn French: Il porte l'enfant dans ses bras. - He carries the child in his arms.

Porter specifically means to physically carry someone or something, supporting their weight. Verbs like amener or emmener mean to take or lead someone to a place, but they do not imply physically lifting them.

For body parts, doesn't French usually use the definite article (like les) instead of possessives (like ses)?

Yes, French usually uses le, la, or les for body parts, especially in reflexive actions like Il se lave les mains. However, when emphasizing whose arms they are in expressions like dans ses bras (in his or her arms), using the possessive adjective ses is completely natural and standard.

Could ses bras also mean 'her arms' in this sentence?

Grammatically, yes. The possessive adjective ses agrees with the plural noun bras, not the gender of the owner. However, because the subject of the sentence is Il (he), we naturally assume these are his own arms unless the context tells us otherwise.

Why do we say dans ses bras rather than sur ses bras?