Actually, dropping across % lines on growth charts (even crossing 2 lines between visits) is not abnormal. Breastfed babies tend to grow faster for the first 2-3 months and gain lines, especially if born at average or below-average weight. And they tend to gain more slowly than formula-fed infants between 6-12 months, so dropping lines is normal and expected. If you compare the 12 month line between the CDC and WHO charts, the mean (50% line) on the WHO charts is really close to the 25% line on the CDC charts.
An ongoing trend of crossing lines on the chart can be an indication of concern, but again, it must be evaluated in light of the child's development and overall well-being. If baby has crossed lines, then the best recommendation (unless other red flags are present) is to check weight again at next well baby check.
Good info on this at kellymom (although dated - does not include WHO charts): http://www.kellymom.com/babyconcerns...ts.html#growth
and in the book "My Child Won't Eat" by Dr. Carlos(?) Gonsalez. Book is unfortunately out of print, but your LLL group library might have a copy. Also: In most children, serial height and weight measurements follow consistently along a ‘channel’ on or between the same percentile(s). It is normal for children to change one to two percentile lines during the first two to three years
, usually moving toward the 50th percentile line. From position statement of the Canadian Pediatric Society.
FWIW, solids in the diet don't add calories. They replace milk (breast or formula). Most solids, especially those offered as first or weaning foods, are less calorie dense than breastmilk. So if baby is eating lots of solids and dropping milk intake rapidly, that will impact weight gain. That doesn't mean it's abnormal or a cause for concern, though, unless it's affecting baby's overall health. This is why nursing before offering solids is recommended, which it sounds like the OP is already doing.