Fact: Monolingualism is the exception. Two third of world population speak more than one language.
Statement: More than one language confuses the child and it mixes the languages.
Fact: No research has yet shown that one language only gives advantages to a child.
Bilingual children between 2-3 years often go through a stage when they mix languages. Their vocabulary in both languages is seldom equally developed. They not only have to learn which word is appropriate in each language, but also which word belongs to which language.
Just repeat mixed sentences in the correct form and flow on. Try to balance the vocabulary in both languages, i.e. talk about out-of-home activities in your language.
Statement: A language is nothing more than language.
Fact: As language is the means of communication it is heavily involved with culture. Language learning means understanding the culture the language belongs to as well.
Statement: Bilingualism means speaking more than one language without accent.
Fact: It is not unusual for bilingual children to speak one language with a foreign accent. The dominance of one language to another may change from time to time.