Rooting reflex (turning head when touched on cheek) disappears between:

3-6 months

Development sequence ascending: (b) Head sags, (a) Head steady, (c) Sits leaning, (d) Sits alone/creeps

b,a,c,d

Emotional development ascending: Excitement, Delight, Affection, Jealousy

d,b,a,c

Crying of infants: (c) First medium of communication (d) In response to temperature/noise/pain

c,d only

Habituation: (b) Gradual reduction in response strength (c) New stimulus causes dishabituation

b,c only