MEXICO CITY (Reuters) -Consumption and foot traffic at Walmart's Mexico unit has begun to pick up in the second quarter, the firm's finance chief said on Wednesday.

"As we look to April, we already see improvements in terms of consumption ... on a like-for-like basis," CFO Paulo Garcia told analysts in a call to review the firm's first quarter results.

Garcia added that the increase had led the firm to hold its outlook for sales growth for the full year at 6% to 7%, after a weaker-than-expected first quarter.