Will it confuse an infant if one parent speak to him/her in two or three languages (on separate occasions)?

Great question: When we live in taiwan we spoke english to my brother who was a baby and the amas spoke chinese to him. He ended up speaking a mix of english and chinese. You would only understand it if you spoke both languages. We later moved to scotland and he quickly forgot the chinese and spoke only english. I hope one of the developmental pediatricians responds to this question. Fascinating.

Neurotypical infants: with bilingual or multilingual home environments reach receptive & expressive language milestones at the appropriate ages, often in one language while mixing in words from the other(s). Infants & children with a genetic or biological set-up for language impairment or dyslexia need one language only. Check family history & monitor development. Use firstsigns.org & healthy children. org.