My baby's first tooth is the lateral incisor. Is this normal?

Yes. Infants can get their teeth in many different orders. Typically the central incisors are first, but it is not abnormal for the laterals to erupt first.
Yes. Dental eruption patterns are quite variable in infancy & do not imply lack of specific teeth or dietary deficiencies. Average is 1/ mo starting @ 4-6m with bottom incisors first and upper 4 later, but its all quite variable & have seen premolars come in first on rare occasion.