Portion of a Relief
Limestone, 14 5/16 x 13 x 2 1/2 in. (36.3 x 33 x 6.3 cm)
Perhaps Late Period-Ptolemaic Period 664-30 B.C.E
Provenance not known
Brooklyn #70.2 , Charles Edwin Wilbour Fund
Photo © Joan Lansberry, May 2008-2016

Drawing from Valley of the Kings, Grave 17, credit: Lepsius
(Tomb KV17 is the tomb of Pharaoh Seti I of the Nineteenth Dynasty.)

Taweret has been "attested since Old Kingdom times". (_The Complete Gods and Goddesses of Ancient Egypt_, Wilkinson, page 185) Not having temples devoted to her, she is usually seen as a protective household goddess.

From the info cards (also museum website):
"The strange vignette of a pregnant hippopotamus with a lion's mane, similar to the goddess Taweret, with a crocodile on her back and another nipping her paw is often found in Egyptian astronomical texts in connection with the northern constellations. However, the inscription at the left on this relief makes such a setting uncertain because it mentions Hapi, the god of the Nile's inundation. The textual genre and the provenance (temple or tomb wall or part of a sarcophagus?) thus remain unknown. The relief comes from either an unparalleled astronomical scene or a tableau featuring Hapi in which the representation of the hippo was "'borrowed" from astronomical scenes. If the hippo is Taweret, then the connection with Hapi is understandable because both had strong denotations of fertility."

"Ancient Egyptian women wore amulets of birth gods to protect them during and immediately after childbirth. One of these birth gods, a female deity often known as Taweret, was shown with the head and body of a hippopotamus, lion's paws, and a stylized crocodile hanging down her back. Her male counterpart, commonly called Bes, usually appeared frontally. In early Dynasty 18, artists depicted Bes with a human face and a lion's body and mane."

Bes was said to be her consort, but Taweret was also called the concubine of Set, as Set has been associated with the hippotamus. (Source Wilkinson, _Complete Gods..._)

Amulet of Taweret
Faience, 1 1/4 x 5/8 x 1/8 in. (3.2 x 1.6 x 0.3 cm)
New Kingdom, XVIII Dynasty, ca. 1539-1478 B.C.E.
Provenance not known
37.967E, Charles Edwin Wilbour Fund

To give you further examples of Taweret, I share some I saw at the Metropolitan Museum:

Taweret at left:
Lion-headed Taweret
Late period, 664-332 B.C.E.
Carnelian or sard
Promised gift of Peter Gottesman,
in memory of George H. Gottesman
MMA L.2000.34.2
Taweret at center:
Amulet, Late Period, Dynasty 2629, 664332 BCE
Faience, 5.1 cm (2 in)
Gift of Darius Ogden Mills, 1904, MMA 04.2.365
Taweret at right:
Amulet, Late Period, Dynasty 2629, 664332 BCE
Faience, h. 9.5 cm (3 3/4 in)
Gift of J. Pierpont Morgan, 1917, MMA 17.194.2236

Another view of the carnelian Taweret:

Here is another example of a Taweret and Bes amulet, tiny but gold, this too from the Metropolitan Museum:

Appliqué with Bes flanked by figures of Taweret
Egypt, New Kingdom, Dynasty 18, 1550-1350 B.C.E.
Gift of Mrs. Frederick Thompson, 1915

This was caught in process of capturing another piece, seen here as well.