Bottle assembly and valve assembly

A bottle assembly comprising:

• a bottle comprising a shoulder opposite a closed end, the shoulder extending radially inward from an inner surface of a bottle wall, the shoulder having a cylindrical neck surrounding an opening at the center of the shoulder;
• a first detent formation extending upward from the shoulder at the periphery of the neck;
• a collar comprising an aperture and a complementary second detent formation;
• and
• a teat configured to be coupled to the collar;
• wherein the collar is configured to snap fit to the shoulder by application of force in a downward direction towards the closed end by the coupling of the first detent formation with the complementary second detent formation extending radially inward from an inner edge of the collar;
• and
• wherein the collar is further configured to disengage from the shoulder.

A bottle assembly comprising:

• a bottle with a shoulder opposite a closed base, the shoulder extending radially inward from an inner surface of a bottle wall and having an open cylindrical neck, the neck extending upward from an inner edge of the shoulder,
• a first detent formation at an outer periphery of the neck, the first detent formation extending upward from the shoulder;
• and
• a teat assembly comprising a teat and a collar, the collar comprising a complementary second detent formation extending radially inward from an inner edge of the collar;
• wherein the first detent formation removably engages with the complementary second detent formation to couple the teat assembly over the neck of the bottle by an application of force pushing the teat assembly downward against the neck of the bottle.