应该是正常。
世界卫生组织2006生长发育标准
0-3岁 男宝宝体重年龄对照表（单位：公斤）
月龄
平均体重
正常体重范围
0
3.2322
2.4-4.214.18733.2-5.525.12823.9-6.635.84584.5-7.546.42375-8.256.89855.4-8.867.2...975.7-9.377.64226-9.887.94876.3-10.298.22546.5-10.5108.486.7-10.9118.71926.9-1
1.2128.94817-11.5139.16997.2-11.8149.3877.4-12.1159.60087.6-12.4169.81247.7-12.61710.02267.9-12.91810.23158.1-13.21910.43938.2-13.52010.64648.4-13.72110.85348.6-142211.06088.7-14.32311.26888.9-14.62411.47759-14.82511.68649.2-15.12611.89479.4-15.42712.10159.5-15.72812.30599.7-162912.50739.8-16.23012.705510-16.53112.900610.1-16.83213.09310.3-17.13313.283710.4-17.33413.473110.5-17.63513.661810.7-17.93613.850310.8-18.1
0-3岁 女宝宝体重年龄对照表（单位：公斤）
0
3.3464
2.5-
4.414.47093.4-
5.825.56754.3-
7.13
6.37625-847.00235.6-
8.757.51056-
9.367.9346.4-9.878.2976.7-10.388.61516.9-10.798.90147.1-11109.16497.4-1
1.4119.41227.6-11.7129.64797.7-12139.87497.9-12.31410.09538.1-12.61510.31088.3-12.81610.52288.4-13.11710.73198.6-13.41810.93858.8-13.71911.1438.9-13.92011.34629.1-14.22111.54869.2-14.52211.75049.4-14.72311.95149.5-152412.15159.7-15.32512.35029.8-15.52612.546610-15.82712.740110.1-16.12812.930310.2-16.32913.116910.4-16.63013.310.5-16.93113.479810.7-17.13213.656710.8-17.43313.830910.9-17.63414.003111-17.83514.173611.2-18.13614.342911.3-18.303.34642.5-4.414.47093.4-5.825.56754.3-7.136.37625-847.00235.6-8.757.51056-9.367.9346.4-9.878.2976.7-10.388.61516.9-10.798.90147.1-11109.16497.4-11.4119.41227.6-11.7129.64797.7-12139.87497.9-12.31410.09538.1-12.61510.31088.3-12.81610.52288.4-13.11710.73198.6-13.41810.93858.8-13.71911.1438.9-13.92011.34629.1-14.22111.54869.2-14.52211.75049.4-14.72311.95149.5-152412.15159.7-15.32512.35029.8-15.52612.546610-15.82712.740110.1-16.12812.930310.2-16.32913.116910.4-16.63013.310.5-16.93113.479810.7-17.13213.656710.8-17.43313.830910.9-17.63414.003111-17.83514.173611.2-18.13614.342911.3-18.3月龄
平均体重
正常体重范围
0
3.3464
2.5-
4.414.47093.4-
5.825.56754.3-
7.13
6.37625-847.00235.6-8.757.51056-9.367.9346.4-9.878.2976.7-10.388.61516.9-10.798.90147.1-11109.16497.4-1
1.4119.41227.6-11.7129.64797.7-12139.87497.9-12.31410.09538.1-12.61510.31088.3-12.81610.52288.4-13.11710.73198.6-13.41810.93858.8-13.71911.1438.9-13.92011.34629.1-14.22111.54869.2-14.52211.75049.4-14.72311.95149.5-152412.15159.7-15.32512.35029.8-15.52612.546610-15.82712.740110.1-16.12812.930310.2-16.32913.116910.4-16.63013.310.5-16.93113.479810.7-17.13213.656710.8-17.43313.830910.9-17.63414.003111-17.83514.173611.2-18.13614.342911.3-18.3