Just out of curiousity?

depends on the child. my son was 9 months old and still required night feeds to gain some more weight. when he got a bug from my little brother he had lsot some weight. he's always been little but it made him even more little. whenever he woke i nursed him, even if he wasnt truly hungry it would help with weight gain- he wasnt underweight but was in the 5th% anyway, he's fed. and since then he's porked up- hes 14 months now and about 21 1/2 pounds