+Number of children and capacity for breast-feeding.+ Concerning this it is remarked: "The upper curve shows what percentage of children had to do without breast feeding, and the lower one how many enjoyed the sufficient period of 39 weeks of breast-feeding. Though Baum's figures are only intended to deal with the number of cases of breast feeding and not with its duration, and though no difference is made between exclusive and partial breast feeding, yet some conclusions may be drawn with regard to suckling capacity. In a district where breast feeding is as general as it is in the one examined into here, the number of women who voluntarily renounce every attempt at suckling must necessarily be small. The curve dealing with the children who had no breast feeding at all is therefore likely to give a fairly correct picture of the absolute or primary incapacity for suckling on the mother's part; absolute incapacity does not of course mean that the mother could not produce a single drop of milk, but that she does not produce enough to satisfy the child, and therefore must resort to artificial feeding. As a period of 39 weeks' feeding, even if only partial, points to a good capacity, the lower curve may also be taken as an expression of feeding ability. A comparison of both figures illustrates that the milk production after the first birth is smaller than after the following ones, and that beyond the eighth birth, it decreases materially and continuously, probably in consequence of the exhaustion of the maternal organism."
+The habit of breast-feeding as running in families and infant mortality.+ With this goes the following explanation: "The two figures illustrate the proportion of mortality of the infants in 143 bottle-feeding families and 376 breast-feeding families of the first order. As the line could not be drawn very sharply, and as in the bottle-feeding families there had to be included those in which as an exception one or other child was suckled for a few days or perhaps for a week, one can see in these groups only the expression of the habit, but not the power of suckling. Both figures illustrate the largely avoidable sacrifice in young lives which still goes on through a want of knowledge and of feeling of responsibility towards the coming race. With the absence of breast-feeding the unfavourable influence of a very large number of children becomes much more apparent; whereas in breast-feeding families the difference in the mortality between medium-sized families (four to six children) and very large families (above ten children) amounts to only 1.39%, it reaches 12.90% with the non-suckling families. Here, if the number of children surpasses ten, nearly every second child dies in the suckling age, and amongst thirteen families there is not a single one which has not lost a child in that period, whereas in breast-feeding families of the first order, with the same large number of children, only every thirteenth child died in infancy, and of sixteen families seven (= 43.75%) lost no infant." The same material is treated in a different way by Dr. Marie Baum, of Dusseldorf, in Figures C 63-66.