Materials used.
Red Heart Baby Hugs. I think this yarn has been discontinued, but any size 3 yarn should work, or Caron Simply Soft size 4 seems to work up the same.
Size F (3.75mm) crochet hook.

Stitches used in US terms
Ch/ch chain
Dc/dc double crochet
Sl st/sl st Slip stitch
Beg cluster (ch 3,dc holding last loop of each on hook, pull through all at once).
Cluster (3 dc, holding last loop of each on hook, pull through all at once).
Beg corner ch 3, 1dc, ch 2, 2dc in same space.
Corner 2 dc, ch 2, 2 dc in same space.

Stitches used in UK terms
Ch/ch chain
Tr/tr treble crochet
Ss Slip stitch
Beg cluster (ch 3,tr holding last loop of each on hook, pull through all at once).
Cluster (3 dr, holding last loop of each on hook, pull through all at once).
Beg corner ch 3, 1tr, ch 2, 2tr in same space.
Corner 2 tr, ch 2, 2 tr in same space.