MILAN, Jan 30 (Reuters) - AC Milan continued their climb up the Serie A table with a 1-0 win at struggling Reggina on Wednesday thanks to Alberto Gilardino's header. The European champions endured a poor first half of the season but are now up to sixth following their fourth league win in five matches this month. Gilardino, who partnered Brazilian teenager Pato upfront, was unmarked when he nodded in Andrea Pirlo's cross on 18 minutes to notch his seventh of the league campaign. Milan could have scored more with Pirlo rattling the bar with a free kick and rare starter Emerson going close, while Reggina rarely threatened at the other end where Australian keeper Zeljko Kalac was preferred to Dida. The match was postponed from December when Milan won the Club World Cup in Japan. Carlo Ancelotti's men, seven points behind fourth-placed Fiorentina and 20 adrift of leaders Inter Milan, host Livorno in another game in hand on Feb. 13 after facing Fiorentina on Sunday and Siena the weekend after.