Breastfeeding social reactions in the English-speaking world. It is possible for a mother to continue breastfeeding an older sibling while also breastfeeding a new baby; this is called "tandem nursing". During the late stages of pregnancy, the milk changes to colostrum. While some children continue to breastfeed even with this change, others may wean. Most mothers can produce enough milk for tandem nursing, but the new baby should be nursed first for at least the first few days after delivery to ensure that it receives enough colostrum. Breastfeeding triplets or larger broods is a challenge given babies' varying appetites. Breasts can
Invariant of a binary form 4"c""a" − "a""d" of degree 4. The algebra of covariants is generated by the discriminant, the form itself (degree 1, order 3), the Hessian "H" (degree 2, order 2) and a covariant "T" of degree 3 and order 3. They are related by the syzygy 4"H"="Df"-"T" of degree 6 and order 6. The algebra of invariants of a quartic form is generated by invariants "i", "j" of degrees 2, 3. This ring is naturally isomorphic to the ring of modular forms of level 1, with the two generators corresponding to the Eisenstein series "E" and "E". The algebra of covariants